AprilAire 310 MERV 11 replacement filter sized for 20x20x4 cabinets — everyday particulate and dust filtration in a compact form factor.
AprilAire is a Madison, Wisconsin manufacturer that has been building whole-house indoor air quality equipment for residential heating and cooling systems since 1954. Every AprilAire filter is engineered to the specific dimensions and airflow characteristics of AprilAire and Space-Gard purifier cabinets — drop-in fit, sealed gaskets, and consistent performance over the rated 6 to 12 month service life.
Deep-pleated 4-inch construction provides far more filtration surface area than a 1-inch HVAC filter, capturing more particulates while creating less restriction on the blower motor. Install behind the cabinet’s hinged door, slide into the rails, and close. Made in the USA — the boxes ship directly from AprilAire’s American factories.
