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Old 05-05-2022, 09:21 PM   #7 (permalink)
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Can you translate? N99 is 99% of particles at what particle size? N100 is 99.97%?

Residential filtering should have a MERV rating. But MERV rating is based on particle size, not per centage of some unknown size.

For instance I have MERV-11, a 14x14 filter directly behind a whole house positive pressure fan.
·Pre-Filters or Final Filters
·Hospital Laboratories
·Better Commercial Buildings
·Superior Residential Buildings

Filters down to 1.0–3.0 micron particle size
'Superior Residential'
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