Aprilaire 313 Replacement Filter For Aprilaire Whole House Air, Pack Of 1 Product Description 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. From the Manufacturer This is the MERV 13 replacement filter Aprilaire Air Cleaners. The filter is the heart of the air cleaner and needs to be changed once a year. Use only genuine Aprilaire SelfSeal #313 to ensure the best performance of your air cleaner. BUY WITH CONFIDENCE This genuine AprilAire 313 replacement air filter was designed and manufactured in the USA by AprilAire ? the leader in indoor air quality solutions ? to optimize the performance of your AprilAire Air Purifier Model: 1310, 2310, 3310, or 4300 CREATE A HEALTHIER HOME by preventing airborne allergens from circulating through the air in your home. This AprilAire 313 replacement air filter traps common allergy triggers as they pass through the MERV 13 filter including dust, pollen, mold spores, bacteria, pet dander, and dust mites. BETTER PERFORMANCE thanks to the patented AprilAire Self-Seal Technology which minimizes the amount of air bypassing the filter EASY AS 1-2-3 TO INSTALL in the unique AprilAire Interlock Rail System. Unpack. Slide in. Close the door. Done. No assembly or cardboard or metal reinforcements needed. NOMINAL AIR FILTER SIZE of 20 x 20 x 4 inches (nominal size is an industry standard filter size system to help you easily identify the correct replacement filter and is not the actual size) PROUD PARTNER OF THE AMERICAN LUNG ASSOCIATION in support of its mission to save lives by improving lung health and preventing lung disease