A small change can make a big difference in your home environment. AprilAire delivers that difference with the 313 Healthy Air 13 Filter. The 313 replacement whole-home filter traps and removes the most common allergens including airborne pollen, mold spores, bacteria, pet dander, dust particles, and dust mites as air circulates through the MERV 13 filter. Discover a healthier home environment with the AprilAire 313 Healthy Air 13. Your HVAC system is protected from airborne particles too, which helps lower your energy costs, and can prolong the life of your equipment. Lengthen your HVAC system's life and improve your home's energy-efficiency by reducing dust buildup. Genuine AprilAire filters are specifically engineered to work with your AprilAire air cleaner and come with the Pure Fit Promise ensuring that the filter will fit your AprilAire air purifier equipment exactly. Efficient home and system protection - extremely low initial resistance and high dust holding capacity support up to 12 month filter life, saving you time on furnace filter changes compared to traditional 1-3 month filters. AprilAire 4-inch filters provide superior filter area (21.3 square feet of filtering media) for harmful particles to be captured compared to common 1-inch filters. The patented Self-Seal Technology assures no air will pass by unfiltered, keeping your home clean and HVAC system operating at peak performance. The AprilAire 313 Healthy Air 13 Filter has a nominal air filter size of 20 x 20 x 4 inches and is compatible with AprilAire Air Cleaner Models 1310, 2310, 3310, and 4300. The AprilAire Patented Interlock Rail System means no assembly required - easy and quick three-step filter replacement process. Illustrated packaging includes detailed air filter replacement instructions. Designed and made in the USA and backed by the AprilAire Clean Coil Commitment. Note: MERV is a scale used to measure the effectiveness of air filters. Higher number values translate to more effective filtration. *Performance tested to ASHRAE 52.2 Standard, minimum efficiency reporting value – MERV 13. Contaminants removed based on air passing through the filtering system.