The 201 Replacement Filter is Compatible with Aprilaire 2200, 2250, and Space Gard 2200 Whole House Air Cleaner Purifiers and Lennox PMAC-20C (Lennox X0445). MERV 13 Air Filter. Package Contents: 2 Pack MERV 13 Air Filter Size: 20X25X6 MERV 13 Filter! No assembly is required. Easily inserts into and out of existing return grille. Lasts Up to 6-12 Months NOTE: This NON-OEM replacement furnace filter is designed by Curebilee, as well as distributed solely by Air Filter Factory. This air filter is meant to be replaced every six months. This is not an Aprilaire OEM product and is not covered under any Aprilaire manufacturer's warranty. The Aprilaire brand name and logos are the registered trademarks of their respective owners. Any use of the Aprilaire brand name or model designation for this product is made solely to demonstrate compatibility.