Fits Whirlpool models AP350 AP450 and AP510 AP45030HO. This HEPA high efficiency filtration captures airborne irritants as small as .3 microns from the air passing through the filter and measures approximately 15 3/4 x 18 7/8 x 2. Also helps effectively filter airborne irritants such as smoke, pollen, dust, pet dander and fabric fibers. For maximum filtration performance, replace filter every 12 months. This is a high quality replacement HEPA air purifier filter by LifeSupplyUSA, exclusively for sale by LifeSupplyUSA. Any brand names or logos are the registered trademarks of their respective owners. Any use of any brand name or model designation for this product is made solely for purposes of demonstrating compatibility.