Ultrafine particles

What evidence applies to ultrafine traffic particles?

Traffic is one of the sources the company names for ultrafine particles, and what it publishes for them is laboratory testing of the filter.

The Ultrafine Particles page states: “Vehicles, fires and smoke release ultrafine particles smaller than 100 nanometers.” It also states that current filtration standards do not rate ultrafine particles, and that HEPA and MERV ratings measure filter performance at 300 nanometers, about 3x larger than the top of the ultrafine range, so a filter's rating does not show how it performs on ultrafine particles. The filter captures airborne particles mechanically and by electrostatic attraction.

The named records are LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and the LMS Technologies Pine-Needle Smoke Report LMS#10471 of 20 October 2025, measured as single-pass fractional efficiency in an ASHRAE 52.2 test duct. Report LMS#9904 records an arithmetic mean efficiency of 75.4% across 16 to 604 nanometres for that 24 × 24 × 2 in. pleated air filter, measured single-pass in an ASHRAE 52.2 test duct under standard LMS aerosol test procedures; it is a single-pass laboratory result, and it does not establish performance on traffic particles in a street or a building, or over a service life. The Terms of Use state: “A reported result describes only what the identified test found.”

Source: C-POLAR — Ultrafine Particles, https://cpolar.tech/contaminants/ultrafine-particles/; C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; Statement of Classification for the NanoFlashing™ Air Filter, NF Technical Products Inc., section 2.5; LMS Technologies, Report LMS#9904, 28 April 2025; LMS Technologies, Inc., Pine-Needle Smoke Report LMS#10471, 20 October 2025. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Which exact filter construction has the reported MERV 15A and ISO ePM1 rating?

Both ratings are held on pocket filters made by VOLZ Filters, one of the manufacturing partners named on the company's About page, and not on a flat panel filter.

Eurovent Certita Certification certifies a ten-pocket filter at ISO ePM1 70% under ISO 16890, with an A class energy rating, on Certificate No. 15.06.011, and that class belongs to the filter tested and does not carry over to a panel filter. MERV 15A is recorded under ASHRAE 52.2-2017 with Appendix J in LMS Technologies, Report 6847, 5 November 2024, on a 24 × 24 × 30 in. pocket filter. LMS Technologies, Report LMS#9904, 28 April 2025, is a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and it is not the report that records MERV 15A. As the company's Validation page puts it, industry standards ASHRAE 52.2 Appendix J and ISO 16890 test electrostatic filters after their temporary charge is removed, showing how they perform without it. A rating belongs to the construction that was tested and to the conditions in the report, and neither rating carries over to a panel filter, to another size or to another product. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: Eurovent Certita Certification, Certificate No. 15.06.011, ISO 16890; LMS Technologies, Report 6847, 5 November 2024, ASHRAE 52.2-2017 with Appendix J; LMS Technologies, Report LMS#9904, 28 April 2025, single-pass fractional efficiency in an ASHRAE 52.2 test duct; C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/; C-POLAR — About, https://cpolar.tech/about/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Does it capture pollen fragments as well as intact pollen grains?

Pollen is named in the company's published sentence, and a pollen fragment is not.

The named air records are LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and LMS Technologies, Report 6847, 5 November 2024, ASHRAE 52.2-2017 with Appendix J, on a 24 × 24 × 30 in. pocket filter, and Eurovent Certita Certification, Certificate No. 15.06.011 under ISO 16890, and each one covers the article and the conditions printed in it. Report 6847 is on a 24 × 24 × 30 in. pocket filter and Certificate No. 15.06.011 on a ten-pocket bag filter, not on a flat panel filter, and a rating belongs to the construction that was tested and to the conditions in the report. NanoFlashing™ is a patented permanent positive polarity (3P) technology. NanoFlashing™ attracts negatively charged particles through electrostatic attraction, and the pollutants the company names for air are ultrafine particles, wildfire smoke and pollen. The filter captures airborne particles mechanically and by electrostatic attraction. The Terms of Use state: “A reported result describes only what the identified test found.”

The company publishes no separate result for a fragment of a pollen grain, and it does not carry a result across to something a test did not cover. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: C-POLAR — NanoFlashing™, https://cpolar.tech/nanoflashing/; C-POLAR — Terms of Use, section 3, https://cpolar.tech/terms/; C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/.

Reviewed on 21 September 2026.

Does a claimed effect on smoke include its gas phase?

The company's published smoke testing is about particles, and it makes no claim about the gas phase of smoke.

The Wildfire Smoke page states that much of wildfire smoke is made up of fine and ultrafine particles, and many carry an electric charge. The filter captures airborne particles mechanically and by electrostatic attraction. The records named under wildfire smoke and ultrafine particles on the Validation page are LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and LMS Technologies, Report 6847, 5 November 2024, ASHRAE 52.2-2017 with Appendix J, on a 24 × 24 × 30 in. pocket filter, and Eurovent Certita Certification, Certificate No. 15.06.011. The smoke report the company's statements cite is LMS Technologies, Inc., Pine-Needle Smoke Report, LMS#10471, 20 October 2025, single-pass fractional efficiency in an ASHRAE 52.2 test duct.

C-POLAR publishes no evidence for a gas or a vapour, and a measurement of particle capture says nothing about a gas. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: C-POLAR — Wildfire Smoke, https://cpolar.tech/contaminants/wildfire-smoke/; C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/; LMS Technologies, Inc., Pine-Needle Smoke Report LMS#10471, 20 October 2025. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Will the pollen the filter catches blow back out when the furnace turns on?

A used NanoFlashing™ filter holds the particles it has captured.

The filter captures airborne particles mechanically and by electrostatic attraction. The Wildfire Smoke page states that the filter “captures and retains” wildfire smoke, and the Ultrafine Particles page states that it “captures and holds” ultrafine particles. The NanoFlashing™ Air Filter label states: “A used filter holds the dust and microorganisms it has taken out of the air.” The company publishes no measurement of captured material coming back off a NanoFlashing™ filter into the air. The Validation page reports measurements in four buildings where NanoFlashing™ was installed; at a financial landmark in London, particulates, bioaerosols and energy were all measured lower after the air handling unit filters were changed to NanoFlashing™. Each is one building over one period, and it is not a result for another building.

Source: C-POLAR — Wildfire Smoke, https://cpolar.tech/contaminants/wildfire-smoke/; C-POLAR — Ultrafine Particles, https://cpolar.tech/contaminants/ultrafine-particles/; NanoFlashing™ Air Filter label; C-POLAR — Validation, https://cpolar.tech/validation/.

Reviewed on 21 September 2026.

What happens to particles that carry little or no net charge?

A particle that carries little or no charge is still met by the media it passes through.

The filter captures airborne particles mechanically and by electrostatic attraction. NanoFlashing™ attracts negatively charged particles through electrostatic attraction. The Statement of Classification adds that the charge does not act on organisms only, and records that in single-pass laboratory testing the filter captured pine-needle smoke and ultrafine particles better than the control filter, and that smoke is neither a pest nor alive.

Capture by the charge and capture by the media are both part of what the filter does, and the company publishes no division of one from the other.

Source: Statement of Classification for the NanoFlashing™ Air Filter, sections 2.1, 2.2 and 2.5, issued by NF Technical Products Inc.; C-POLAR — NanoFlashing™, https://cpolar.tech/nanoflashing/.

Reviewed on 21 September 2026.

Does particle size change the relative importance of electrical attraction?

The company publishes no model that assigns capture at a given particle size to one mechanism rather than another; particle size is part of what the named air testing measured.

The filter captures airborne particles mechanically and by electrostatic attraction, and NanoFlashing™ attracts negatively charged particles through electrostatic attraction. The Statement of Classification records that in single-pass laboratory testing the filter captured pine-needle smoke and ultrafine particles better than the control filter. The named air records on the Validation page are LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and Report 6847, ASHRAE 52.2 with Appendix J, and Eurovent Certita Certification, Certificate No. 15.06.011. Report 6847 covers a 24 × 24 × 30 in. pocket filter and Certificate No. 15.06.011 a ten-pocket bag filter, not a flat panel filter, and a rating belongs to the construction that was tested and to the conditions in the report. The Validation page also states: “Industry standards ASHRAE 52.2 Appendix J and ISO 16890 test electrostatic filters after their temporary charge is removed, showing how they perform without it.”

Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; Statement of Classification for the NanoFlashing™ Air Filter, sections 2.1, 2.2 and 2.5, issued by NF Technical Products Inc; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

How is the effect distinguished from ordinary adhesion to fibres?

The company states the two together and does not separate them.

The filter captures airborne particles mechanically and by electrostatic attraction. NanoFlashing™ attracts negatively charged particles through electrostatic attraction. The Statement of Classification adds that the charge does not act on organisms only, and records that in single-pass laboratory testing the filter captured pine-needle smoke and ultrafine particles better than the control filter, and that smoke is neither a pest nor alive.

Capture by the charge and capture by the media are both part of what the filter does, and the company publishes no division of one from the other.

Source: Statement of Classification for the NanoFlashing™ Air Filter, sections 2.1, 2.2 and 2.5, issued by NF Technical Products Inc.; C-POLAR — NanoFlashing™, https://cpolar.tech/nanoflashing/.

Reviewed on 21 September 2026.

Does the mechanism imply selectivity for one particle type over another?

The published sentence names negatively charged particles, and the Statement of Classification adds that the charge does not act on organisms only.

The filter captures airborne particles mechanically and by electrostatic attraction. NanoFlashing™ attracts negatively charged particles through electrostatic attraction. The Statement of Classification adds that the charge does not act on organisms only, and records that in single-pass laboratory testing the filter captured pine-needle smoke and ultrafine particles better than the control filter, and that smoke is neither a pest nor alive.

Capture by the charge and capture by the media are both part of what the filter does, and the company publishes no division of one from the other.

Source: Statement of Classification for the NanoFlashing™ Air Filter, sections 2.1, 2.2 and 2.5, issued by NF Technical Products Inc.; C-POLAR — NanoFlashing™, https://cpolar.tech/nanoflashing/.

Reviewed on 21 September 2026.

What evidence applies to the actual installed system rather than a material sample?

The company's evidence is evidence about NanoFlashing™ filter media and about the filters and sites named with it; evidence about an installed system in a particular building comes from that system's own commissioning and measurement.

The Terms of Use state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.” They also state: “Use evidence, specifications, instructions, and warnings specific to the actual finished product and use.” The label for the NanoFlashing™ Air Filter states: “Results in a building depend on the system, the airflow, and how well the filter fits its track.” The nearest published measurements of installed systems are on the Validation page, which reports two identical towers compared at a public hospital in Vancouver, and before-and-after air handling unit measurements at a financial landmark in London, a major international airport in the US and a public university in Melbourne, each over a stated period. At each site the Validation page reports bioaerosols, and at three of them particulates, independently measured with MicronView's 405 nm Bio-fluorescent Air Monitoring System. Each is one building over one period, and it is not a result for another building.

Source: C-POLAR — Terms of Use (https://cpolar.tech/terms/) and C-POLAR — Validation (https://cpolar.tech/validation/); NanoFlashing™ Air Filter label.

Reviewed on 21 September 2026.

What measured pressure drop and airflow data apply to the exact filter configuration I plan to specify?

This site publishes no pressure-drop or airflow data for any filter configuration; the data for a specific configuration comes from the manufacturing partner who makes that filter.

The Validation page names Eurovent Certita Certification, Certificate No. 15.06.011, which certifies a ten-pocket bag filter at ISO ePM1 70% with an A class energy rating. Certificate No. 15.06.011 covers a ten-pocket bag filter, not a flat panel filter; a rating belongs to the construction that was tested. NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. Every commercial NanoFlashing™ product is made by a manufacturing partner, in their facility, in their format. The label for the NanoFlashing™ Air Filter states a rated airflow and a maximum face velocity, and a replacement point set by pressure drop or by elapsed time, whichever comes first. The company names its manufacturing and distribution partners on the About page and the Air page: Aero Pro, AQ Filter, BGE Indoor Air Quality Solutions, Olympic International and VOLZ Filters. Enquiries about a specific configuration go to [email protected]. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: C-POLAR — About (https://cpolar.tech/about/), C-POLAR — Terms of Use (https://cpolar.tech/terms/) and C-POLAR — Contact (https://cpolar.tech/contact/); NanoFlashing™ Air Filter label; C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/; C-POLAR — NanoFlashing™ Air, https://cpolar.tech/air/.

Reviewed on 21 September 2026.

Does a laboratory result tell me how the complete product will perform in my room or water system?

A laboratory result states what that test found on what it tested; how a complete product performs in a room is a property of the room, the system and the installation.

The Terms of Use state: “A test of C-POLAR material, a component, or a prototype does not establish the performance of a finished product that incorporates it. Construction, processing, storage, wear, cleaning, other components, and actual use may change the result.” They also state: “Use evidence, specifications, instructions, and warnings specific to the actual finished product and use.” The label for the NanoFlashing™ Air Filter states: “Results in a building depend on the system, the airflow, and how well the filter fits its track.” The nearest published measurements of installed systems are on the Validation page: two identical towers compared at a public hospital in Vancouver, and before-and-after air handling unit measurements at a financial landmark in London, a major international airport in the US and a public university in Melbourne, each over a stated period. At each site the Validation page reports bioaerosols, and at three of them particulates, independently measured with MicronView's 405 nm Bio-fluorescent Air Monitoring System. Each is one building over one period, and it is not a result for another building. For a water system the Terms state that the Water chapter describes a Research Application, and that it does not describe a finished product currently available from C-POLAR for that use.

Source: C-POLAR — Terms of Use (https://cpolar.tech/terms/) and C-POLAR — Validation (https://cpolar.tech/validation/); NanoFlashing™ Air Filter label.

Reviewed on 21 September 2026.

What evidence supports any claimed energy saving after accounting for actual airflow and filter loading?

The company does not claim an energy saving for a filter in a system it has not measured.

On the Validation page the company reports a six-month measurement at a financial landmark in London, March 2024 to September 2024, made before and after the air handling unit filters were changed to NanoFlashing™, in which particulates, bioaerosols and energy were all measured lower. The Validation page also names Eurovent Certita Certification, Certificate No. 15.06.011, which certifies a ten-pocket bag filter at ISO ePM1 70% with an A class energy rating; a rating belongs to the construction that was tested. The Terms of Use state: “A reported result describes only what the identified test found.” They also state: “Use evidence, specifications, instructions, and warnings specific to the actual finished product and use.” That is one building over one period, measured after a filter change in its own air handling units; it is not an energy figure for another system, another filter configuration or another loading condition.

Source: C-POLAR — Validation (https://cpolar.tech/validation/), C-POLAR — Terms of Use (https://cpolar.tech/terms/) and Eurovent Certita Certification, Certificate No. 15.06.011, ISO 16890.

Reviewed on 21 September 2026.

How does the filter change the operating point on my fan's performance curve?

The filter's resistance adds to the pressure the system's fan works against; the operating point on a fan's performance curve is taken from the finished filter's own data and the system's commissioning readings, and the company does not publish the pressure drop the filter adds.

The one building energy measurement the company publishes is at a financial landmark in London over six months from March 2024 to September 2024, measured before and after the air handling unit filters were changed to NanoFlashing™. The Validation page names Eurovent Certita Certification, Certificate No. 15.06.011, which certifies a ten-pocket bag filter at ISO ePM1 70% with an A class energy rating; a rating belongs to the construction that was tested. This site publishes no fan curve, pressure-drop curve, motor load or duct data, and it does not model a particular system. NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. The filter is passive. It draws no power, and it has no power supply, electrode, lamp or reservoir. The label for the NanoFlashing™ Air Filter states a rated airflow and a maximum face velocity, and instructs: “Do not use where this filter would restrict airflow beyond the system's specification.” It also states: “Improper installation can reduce airflow or damage the equipment.” C-POLAR markets a materials technology.

Source: NanoFlashing™ Air Filter label; C-POLAR — Terms of Use (https://cpolar.tech/terms/); C-POLAR — Validation, https://cpolar.tech/validation/.

Reviewed on 21 September 2026.

Will the existing motor draw more current after this retrofit?

The filter draws no power, but its resistance adds to the pressure the system's fan works against; whether an existing motor draws more current after a retrofit is settled by that system's own measurements, and the company does not publish a motor load figure.

The one building energy measurement the company publishes is at a financial landmark in London over six months from March 2024 to September 2024, measured before and after the air handling unit filters were changed to NanoFlashing™. The Validation page names Eurovent Certita Certification, Certificate No. 15.06.011, which certifies a ten-pocket bag filter at ISO ePM1 70% with an A class energy rating; a rating belongs to the construction that was tested. This site publishes no fan curve, pressure-drop curve, motor load or duct data, and it does not model a particular system. NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. The filter is passive. It draws no power, and it has no power supply, electrode, lamp or reservoir. The label for the NanoFlashing™ Air Filter states a rated airflow and a maximum face velocity, and instructs: “Do not use where this filter would restrict airflow beyond the system's specification.” It also states: “Improper installation can reduce airflow or damage the equipment.” C-POLAR markets a materials technology.

Source: NanoFlashing™ Air Filter label; C-POLAR — Terms of Use (https://cpolar.tech/terms/); C-POLAR — Validation, https://cpolar.tech/validation/.

Reviewed on 21 September 2026.

Does a variable-speed fan compensate for loading within its available range?

Whether a variable-speed fan can compensate within its available range is answered from that fan's own data and the system's measurements, and the company does not publish a loading curve.

The one building energy measurement the company publishes is at a financial landmark in London over six months from March 2024 to September 2024, measured before and after the air handling unit filters were changed to NanoFlashing™. The Validation page names Eurovent Certita Certification, Certificate No. 15.06.011, which certifies a ten-pocket bag filter at ISO ePM1 70% with an A class energy rating; a rating belongs to the construction that was tested. This site publishes no fan curve, pressure-drop curve, motor load or duct data, and it does not model a particular system. NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. The filter is passive. It draws no power, and it has no power supply, electrode, lamp or reservoir. The label for the NanoFlashing™ Air Filter states a rated airflow and a maximum face velocity, and instructs: “Do not use where this filter would restrict airflow beyond the system's specification.” It also states: “Improper installation can reduce airflow or damage the equipment.” C-POLAR markets a materials technology.

Source: NanoFlashing™ Air Filter label; C-POLAR — Terms of Use (https://cpolar.tech/terms/); C-POLAR — Validation, https://cpolar.tech/validation/.

Reviewed on 21 September 2026.

Can a supplier provide performance curves rather than a single nominal operating point?

A curve for a particular filter comes from the manufacturing partner who makes it, and the company publishes no performance curve.

The Validation page names Eurovent Certita Certification, Certificate No. 15.06.011, which certifies a ten-pocket bag filter at ISO ePM1 70% with an A class energy rating. Certificate No. 15.06.011 covers a ten-pocket bag filter, not a flat panel filter; a rating belongs to the construction that was tested. The one building energy measurement the company publishes is at a financial landmark in London over six months from March 2024 to September 2024, measured before and after the air handling unit filters were changed to NanoFlashing™. NanoFlashing™ is a permanent positive polarity engineered into filter media itself. It is a physical property of the filter. Every commercial NanoFlashing™ product is made by a manufacturing partner, in their facility, in their format. The label for the NanoFlashing™ Air Filter states a rated airflow and a maximum face velocity, and a replacement point set by pressure drop or by elapsed time, whichever comes first. Enquiries about a specific configuration go to [email protected]. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: C-POLAR — About (https://cpolar.tech/about/), C-POLAR — Terms of Use (https://cpolar.tech/terms/) and C-POLAR — Contact (https://cpolar.tech/contact/); NanoFlashing™ Air Filter label; C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/.

Reviewed on 21 September 2026.

Which exact standard, edition and test conditions support each standards-related statement?

Each numbered report and certificate behind a standards statement is named below with its institution, its number and the standard it names.

The air performance statements rest on LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures; on LMS Technologies, Report 6847, 5 November 2024, ASHRAE 52.2-2017 with Appendix J, a 24 × 24 × 30 in. pocket filter; and on ISO 16890, in Eurovent Certita Certification Certificate No. 15.06.011. The fire statements rest on UL 900, Safety for Air Filter Units, 8th edition dated April 21, 2015, in Intertek Building & Construction reports 105175501SAT-001 on a panel filter, 104974202SAT-001 on a bag filter and 105169484SAT-001 on a fan coil filter, and on ULC-S111-13, Standard Method of Fire Tests for Air Filter Units, 5th edition December 2013, in Intertek reports 106093268SAT-001 on a pleated filter and 106079483SAT-001 on a pocket filter. DIN 53438-3 is covered by RST Rail System Testing reports P60-22-0003 and P60-24-0297 on filter media. The EU RoHS statement rests on Intertek, Report HKGT05289390, 14 January 2022, RoHS Directive (2011/65/EU). The textile statement rests on OEKO-TEX® STANDARD 100, Product Class II, certificate 17.0.25812. The laboratory studies run under Good Laboratory Practice to US EPA Health Effects Test Guidelines are Product Safety Labs Studies 65321, 65322, 65323 and 65324. Among the reports behind the statements about viruses, bacteria and fungal spores, these three name their standards. Guangdong Detection Center of Microbiology, Report 2020FM20686R01E, 13 August 2020, tested a nonwoven filter medium against influenza A virus (H3N2) under ISO 18184:2014. Textile Testing Institute – Brno (TZÚ), Test Report AZL 26/0757-02, 3 July 2026, a laboratory accredited to ISO/IEC 17025, tested a MERV 15A filter medium under ISO 20743 and ISO 18184. Instituto Valenciano de Microbiología, Report D/26/B0483, 6 August 2026, tested a VOLZ PROsyntex PLUS PM1 70 filter medium against Aspergillus brasiliensis and Aspergillus niger under ISO 13629-2:2014. Each report states the article it tested and the conditions it tested at, and those are the limits of what it supports. Both numbers can be checked at source: certificate 17.0.25812 in OEKO-TEX’s public label check, and Certificate No. 15.06.011 in the Eurovent Certita Certification certified product directory.

Source: C-POLAR — Validation, https://cpolar.tech/validation/, and the named reports and certificates: LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and Report 6847, 5 November 2024, ASHRAE 52.2-2017 with Appendix J; Eurovent Certita Certification Certificate No. 15.06.011 (ISO 16890); Intertek Building & Construction Reports 105175501SAT-001, 104974202SAT-001 and 105169484SAT-001 (UL 900, 8th edition, 2015) and 106093268SAT-001 and 106079483SAT-001 (ULC-S111-13, 5th edition, 2013); RST Rail System Testing Reports P60-22-0003 and P60-24-0297 (DIN 53438-3); Intertek, Report HKGT05289390, 14 January 2022, RoHS Directive (2011/65/EU); OEKO-TEX Service GmbH Certificate 17.0.25812 (OEKO-TEX® STANDARD 100, Product Class II); Product Safety Labs Studies 65321 to 65324; OEKO-TEX Label Check, read 19 September 2026, https://www.oeko-tex.com/en/label-check; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/; Guangdong Detection Center of Microbiology, Report 2020FM20686R01E, 13 August 2020, ISO 18184:2014; Textile Testing Institute – Brno (TZÚ), Test Report AZL 26/0757-02, 3 July 2026, ISO 20743 and ISO 18184; Instituto Valenciano de Microbiología, Report D/26/B0483, 6 August 2026, ISO 13629-2:2014. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Does a rating describe the lowest efficiency over a particle range or an average?

The two ratings the company publishes are built differently, and their names say so.

MERV is the minimum efficiency reporting value under ANSI/ASHRAE Standard 52.2. It is built from the lowest efficiencies the filter reaches in each particle size range as dust is loaded during the test, not from a single reading on a clean filter. An ISO 16890 class rates a filter against a particle fraction, ePM1, ePM2.5 or ePM10, and the class the filter holds is the one the certificate states. As the company's Validation page puts it, industry standards ASHRAE 52.2 Appendix J and ISO 16890 test electrostatic filters after their temporary charge is removed, showing how they perform without it. Neither rating is a single number describing a whole filter in a building, and neither converts into the other. Certificate No. 15.06.011 covers a ten-pocket bag filter, not a flat panel filter, and Report 6847 is on a 24 × 24 × 30 in. pocket filter; a rating belongs to the construction that was tested. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: ANSI/ASHRAE Standard 52.2, as named in LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and Report 6847, ASHRAE 52.2 with Appendix J; ISO 16890, as named in Eurovent Certita Certification Certificate No. 15.06.011; C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Can a minimum efficiency rating be substituted for a clean-air delivery rating?

They measure different things, on different articles.

MERV is the minimum efficiency reporting value under ANSI/ASHRAE Standard 52.2. It is built from the lowest efficiencies the filter reaches in each particle size range as dust is loaded during the test, not from a single reading on a clean filter. An ISO 16890 class rates a filter against a particle fraction, ePM1, ePM2.5 or ePM10, and the class the filter holds is the one the certificate states. A clean air delivery rate is a rating of a portable room air cleaner as a whole appliance, measured under ANSI/AHAM AC-1, the standard for portable household electric room air cleaners. One rates a filter; the other rates an appliance with its own fan, its own housing and its own airflow. This site publishes no clean air delivery rate for its filter. Certificate No. 15.06.011 covers a ten-pocket bag filter, not a flat panel filter, and Report 6847 is on a 24 × 24 × 30 in. pocket filter; a rating belongs to the construction that was tested. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory. NanoFlashing™ is a technology; the name, rating and sale of a product that carries it are set by that product's maker and seller.

Source: ANSI/ASHRAE Standard 52.2, as named in LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and Report 6847, ASHRAE 52.2 with Appendix J; ISO 16890, as named in Eurovent Certita Certification Certificate No. 15.06.011; C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Does a room-air-cleaner rating apply at the fan speed customers normally use?

This site publishes no clean air delivery rate, so it makes no claim at any fan speed.

A clean air delivery rate is a rating of a portable room air cleaner as a whole appliance, measured under ANSI/AHAM AC-1, the standard for portable household electric room air cleaners. It describes the appliance at the setting used in that test, and that setting is stated with the rating. The company's ratings are filter ratings. MERV is the minimum efficiency reporting value under ANSI/ASHRAE Standard 52.2. It is built from the lowest efficiencies the filter reaches in each particle size range as dust is loaded during the test, not from a single reading on a clean filter. An ISO 16890 class rates a filter against a particle fraction, ePM1, ePM2.5 or ePM10, and the class the filter holds is the one the certificate states. Where a partner builds the filter into an appliance, that appliance and any rating it holds are the partner's.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — About, https://cpolar.tech/about/.

Reviewed on 21 September 2026.

Do two quoted ratings use editions of a standard with different classification rules?

The company names the standard and, where the document states it, the edition behind each rating it cites from a numbered report or certificate.

The two air ratings come from two different standards, not from two editions of one: MERV 15A from ANSI/ASHRAE Standard 52.2-2017 with Appendix J, recorded in LMS Technologies, Report 6847, 5 November 2024, and ISO ePM1 70% with an A class energy rating from Eurovent Certita Certification Certificate No. 15.06.011, which certifies a ten-pocket bag filter under ISO 16890. They classify by different rules, and a class under one does not convert into a class under the other. Certificate No. 15.06.011 covers a ten-pocket bag filter, not a flat panel filter, and Report 6847 is on a 24 × 24 × 30 in. pocket filter; a rating belongs to the construction that was tested. The fire reports name their editions on their own scope lines: UL 900, Safety for Air Filter Units, 8th edition dated April 21, 2015, in Intertek reports 105175501SAT-001, 104974202SAT-001 and 105169484SAT-001; and ULC-S111-13, Standard Method of Fire Tests for Air Filter Units, 5th edition December 2013, in Intertek reports 106093268SAT-001 and 106079483SAT-001. A rating is read with the standard and the edition that produced it, and not on its own. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and Report 6847, 5 November 2024, ASHRAE 52.2-2017 with Appendix J; Eurovent Certita Certification, Certificate No. 15.06.011, ISO 16890; Intertek Building & Construction, Reports 105175501SAT-001, 104974202SAT-001 and 105169484SAT-001, UL 900 8th edition dated April 21, 2015; Intertek Building & Construction, Reports 106093268SAT-001 and 106079483SAT-001, ULC-S111-13 5th edition December 2013; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Are a filter's initial and conditioned results disclosed together?

The ratings the company publishes come from standards that account for the loss of a temporary charge.

As the company's Validation page puts it, industry standards ASHRAE 52.2 Appendix J and ISO 16890 test electrostatic filters after their temporary charge is removed, showing how they perform without it. That is why the MERV rating the company quotes carries the A suffix: it is the rating measured after the conditioning step in Appendix J of that standard. The ISO 16890 class that Eurovent Certita Certification Certificate No. 15.06.011 gives the filter is ISO ePM1 70%, and the certificate record carries the ePM1 average efficiency and the ePM1 minimum efficiency together. Certificate No. 15.06.011 covers a ten-pocket bag filter, not a flat panel filter, and Report 6847 is on a 24 × 24 × 30 in. pocket filter; a rating belongs to the construction that was tested. The full report and the full certificate carry the measurements behind each rating. Certificate No. 15.06.011 can be looked up at source in the Eurovent Certita Certification certified product directory.

Source: C-POLAR — Validation, https://cpolar.tech/validation/; LMS Technologies, Report LMS#9904, 28 April 2025, a single-pass fractional efficiency test on a 24 × 24 × 2 in. pleated air filter in an ASHRAE 52.2 test duct, in accordance with standard LMS aerosol test procedures, and Report 6847, ASHRAE 52.2 with Appendix J; Eurovent Certita Certification, Certificate No. 15.06.011, ISO 16890; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Does the Eurovent ‘A’ energy class shown on the Validation page mean the filter qualifies for a US ENERGY STAR rating or a tax credit or utility rebate?

No. The A on the Validation page is the energy efficiency class on a Eurovent certificate, and the company publishes no ENERGY STAR listing, tax credit or utility rebate for the filter.

The Validation page names Eurovent Certita Certification, Certificate No. 15.06.011, and states that Eurovent certifies the filter with an A class energy rating. The certificate gives that class as an energy efficiency class based on ISO 16890, for the model PROsyntex PLUS-PM1/70-635-10, with VOLZ LUFTFILTER GmbH & Co. KG as the participant. A certificate belongs to the model it names. A question about a particular rebate or credit programme can be sent to [email protected].

Source: C-POLAR — Validation, https://cpolar.tech/validation/; Eurovent Certita Certification, Certificate No. 15.06.011; C-POLAR — Contact, https://cpolar.tech/contact/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.

Is there a recognized standard written specifically for a “destroys on contact” claim on a solid article, separate from filtration-efficiency standards?

The company names no single standard for a claim of destruction on contact; each contact test it cites is reported under its own standard, on a named medium, against an untreated control.

The filter is intended to destroy the viruses, bacteria and fungal spores it captures. It destroys them on direct contact with the positive electric charge, by physical means, and only while the organism is captured by the positive electric charge. Guangdong Detection Center of Microbiology, Report 2020FM20686R01E, 13 August 2020, tested a nonwoven filter medium against influenza A virus (H3N2) under ISO 18184:2014. Textile Testing Institute – Brno (TZÚ), Test Report AZL 26/0757-02, 3 July 2026, a laboratory accredited to ISO/IEC 17025, tested a MERV 15A filter medium under ISO 20743 and ISO 18184. Instituto Valenciano de Microbiología, Report D/26/B0483, 6 August 2026, tested a VOLZ PROsyntex PLUS PM1 70 filter medium against Aspergillus brasiliensis and Aspergillus niger under ISO 13629-2:2014. Each is a contact test on the medium against an untreated control; it is not an airborne result and not a result for a finished filter in a building. The Viruses page shows airborne virus at 1.3 m/s airflow, NanoFlashing™ beside a control, and states: “NanoFlashing™ captures the virus, and destroys it.” The Mold page shows airborne mold spores at 1.6 m/s airflow, NanoFlashing™ beside a control, and states: “NanoFlashing™ captures the mold, and destroys it.” The Mold page also states that researchers at Massachusetts General Hospital and Harvard Medical School, in a study with funding from the U.S. National Institutes of Health, tested NanoFlashing™ with more than 100 million live, dry spores driven in by fast-moving air. ASHRAE 52.2 and ISO 16890, the standards named for the Validation page's air-filtration ratings, measure what a filter takes out of the air, and they say nothing about what happens to what is captured.

Source: Statement of Classification for the NanoFlashing™ Air Filter, section 2.6, issued by NF Technical Products Inc.; Guangdong Detection Center of Microbiology, Report 2020FM20686R01E, 13 August 2020; Textile Testing Institute – Brno (TZÚ), Test Report AZL 26/0757-02, 3 July 2026; Instituto Valenciano de Microbiología, Report D/26/B0483, 6 August 2026; C-POLAR — Validation, https://cpolar.tech/validation/; C-POLAR — Viruses, https://cpolar.tech/contaminants/viruses/; C-POLAR — Mold, https://cpolar.tech/contaminants/mold/. A copy may be made available on our review of the request.

Reviewed on 21 September 2026.