20X20X4 Merv 13 Aprilaire 313 Gasketed Replacement HVAC 6-month Air Filter

20" X 20" X 4" Merv 13 APRILAIRE Model 313 Gasketed Replacement Filter. Our Filter Gasket fits the April Aire cabinets slot, so the filter slides into place and prevents dirty air bypass found in other models. The filter is already in frame making no assembly required. Much cleaner and easier to install and replace! Gasket measures 3/8" on top and bottom. This deep pleated Media Air Cleaner delivers MERV 13 rated filter efficiency, delivers the lowest pressure resistance/pressure drop, highest dust holding capacity, and longest service life, which provides cleaner air to breathe and improved HVAC system efficiency via cleaner components. This filter is constructed with a synthetic media that delivers high filtering efficiency. MERV 13 rated filters removes 85% particle size ranges from 1 to 3 microns in size (which includes most viruses, COVID, bacteria, flu, allergens, smoke, and dust) from the breathing air per ASHRAE 52.2 test results. Filter lasts 9 to 12 months. Actual Filter Size: 18.375" x 19.125" x 3.75"