Get Upto $80 Discount On Winix Air Purifier At Bestbuy.com. This Winix Fres Home P300 air purifier uses a True HEPA filter, activated carbon pre-filter and Plasma Wave technology to remove pet dander, smoke, pollen, mold spores and other allergens from a space up to 300 sq. ft. It has up to 300 sq. ft. coverage area which helps one keep the air in the home clean. The 3-stage air cleaning uses a True HEPA filter and activated carbon pre-filter to remove household odors, hair, lint, pet dander, smoke, pollen, mold spores and more. The Plasma Wave technology helps break down odors, chemical vapors and other pollutants at the molecular level. The 4 fan speeds enable custom airflow.