Jim Rosenthal
These tests were done to determine the long term effectiveness of MERV 13 filters in #corsirosenthalboxes. These CR Boxes were used 24/7 in an office/factory. They had about the same efficiency and flow at 10 months. Both the App. J in 52.2 and ISO 16890 miss by a wide margin.
Smart Air
@CureCFS @NicVinny @JimRosenthal4 Great question! The filters that Jim tested belong to the "little more mixed" category I alluded to. For filters that use static charges, the loss of static charge over time will decrease the percentage of particles they can capture in one pass. That's Jim's graph. 10 mths < new
