This filter is a replacement for Aprilaire 201, models 2200 and 2250. It has an effiency of MERV 11 and lasts approximately six months depending on use. It also fits Source 1, S1-FM201, also fits BestAir Pro SGMPR.
Note: This filter doesn't fit new 2009 upgrade kit.
This product is not manufactured or distributed by Research Products Corporation, owner of the registered trademark Aprilaire®.