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National Filter Supply :: Furnace Filters :: 4-inch Filters :: 4" MERV 8 Filters
NFS's 4" MERV 8 air filters are designed for Residential and Commercial use. This filter is made from synthetic meida with an ASHRAE 52.1 average atmospheric efficiency of 25% to 30% and an average arrestane exceeding 90% by weight. The 4" filters hanlde velocities upto 650 fpm.
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