Could high indoor humidity during a smoke event change the filter's performance?

Could high indoor humidity during a smoke event change the filter's performance?

The label directs use in dry air only, and directs that the filter not be used anywhere the media may become wet; the company publishes no humidity result.

Under wildfire smoke and ultrafine particles the 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 Report 6847, ASHRAE 52.2 with Appendix J, and Eurovent Certita Certification, Certificate No. 15.06.011. 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. The Terms of Use state: “A reported result describes only what the identified test found.” They also 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.”

What can be checked on a sample after any handling is the charge. The polarity is a positive electric charge at rest. It is measured as surface charge density, in nanocoulombs per square centimetre. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.

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

Source: NanoFlashing™ Air Filter label; 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., sections 2.2 and 2.3; Eurovent Certita Certification certified product directory, read 19 September 2026, https://www.eurovent-certification.com/.

Reviewed on 21 September 2026.