This air cleaner is powerful enough to clean the air in a 1,500 square foot room twice an hour. The large HEPA filter contains a hefty 15 lbs. of solid Activated Carbon and Zeolite in the long-lasting replaceable filter. The Austin Air Healthmate Standard HM400 meets or exceeds all HEPA filter standards, efficiently trapping 99.97% of all particles larger than .3 microns, such as: pollen, pet dander, tobacco smoke, mold, bacteria, allergens, and most gases and odors.Rugged 14.5" square x 23" high, 22 gauge perforated steel housing with a powder-coated enamel finish that won`t chip, crack or peel. Quiet 3 Speed centrifugal fan. Full 5 year guarantee on all parts and labor. The HEPA filter element has a pro-rated 5 year warranty under normal residential usage. Weight: 45 lbs. FREE delivery