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National Filter Supply :: Furnace Filters :: 4-inch Filters :: 4" MERV 11 Filters
NFS's 4" MERV 11 air filters are designed for Residential and Commercial use. This filter is made from synthetic meida with an ASHRAE 52.2 rating of MERV 11. The 4" filters hanlde velocities upto 650 fpm.
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