The MERV 8 Trophy Air Washable Filter ... It’s capable of filtering out particles as small as 0.3 microns, but the furnace filter needs to be changed every 90 days to work as advertised.

The Simply Filters Simply by MervFilters MF202016 Merv 8 is part of the Air Filters test program at Consumer Reports. In our lab tests, Furnace Filters, Air Conditioner Filters & Air Filters ...