Aprilaire 401 Model 2400 Retrofit Replacement Box Filter, No Need For Spacers, Filter Fits Into Reusable Plastic Cartridge / Frame. MERV 10, Actual Size 15 3/8" x 27 3/8" x 5 1/4." Case of 3 Made in Canada by FurnaceFilters.Ca
Must Have The Original Aprilaire 2400 Reusable Plastic Cartridge / Frame As Shown in Picture to Use This Box Filter.
Fits Inside Your Existing Aprilaire Model 2400 High Efficiency Air Cleaner Reusable Plastic Cartridge / Frame
