Aprilaire 401 | Filter Media For Mfg No 2400 | 31TP08 | Raptor Supplies Worldwide
401-RESE RESEARCH PROD APRILAIRE MEDIA AIR CLEANER MODEL 2400 | eBay
Amazon.com: WKZO 401 Replacement Air Filter for Aprilaire Model 2400, GeneralAire Model AC24, Source1 Model S1-MAC11162506, (Pack of 1) : Home & Kitchen
2210-APR - Aprilaire 2210-APR - 20" x 25" Merv 13 Media Air Cleaner
Aprilaire 2400 Air Cleaner 29 9/16W x 10D x 17 3/4H Inch Non-Electric Whole-House Air Cleaner