Does a sensor upstream of the filter answer a different question from one downstream?
Last reviewed: .
Does a sensor upstream of the filter answer a different question from one downstream?
Yes: a sensor upstream of the filter reads the air reaching it, and a sensor downstream reads the air that has passed through it.
ASHRAE 52.2 and ISO 16890 measure what a filter takes out of the air, and they say nothing about what happens to what is captured. A measurement taken before a filter and a measurement taken after it describe what that filter removed from the air that passed through it. The company's position on destruction is stated in the Statement of Classification for the NanoFlashing™ Air Filter, section 2.6: 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.
The field observations on the Validation page were measured with MicronView's 405 nm Bio-fluorescent Air Monitoring System, which distinguishes biological particles from inert dust in real time, and they are reported separately from laboratory testing. The Terms of Use state: “A reported result describes only what the identified test found.”
Source: 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 2.6.
Reviewed on .
Sources
- C-POLAR — Validation
- C-POLAR — Terms of Use, section 3
- Statement of Classification for the NanoFlashing™ Air Filter, section 2.6, NF Technical Products Inc.