Door Filter Home Air Filter For Doorways and Entryways, White FRESH AIR - Door Filter dramatically reduces the odors, allergen, pests, microbes, irritants, and other air contaminants from entering your apartment or office. It is designed to create more pleasant, low-maintenance air environments, but is quite effective against allergies, asthma, and lung damage. MULTI-STAGE FILTER - The replaceable, innovative filter is lab-tested against particles of all sizes, from larger plant spores and visible dust, down to fumes and smokes under a micron wide. This results in a home virtually free of plant allergens, pet dander, coarse and fine dust, bacteria, cooking smoke, metallic fumes, construction debris, and pollution. Corridor pressure pushes air in, Door Filter makes it fresh. CLEAN, PEACEFUL SPACE- As well as passively scrubbing the air clean, Door Filter reduces the noise, light, and draft leaking into your home or workspace, so you can focus on the things that matter to you. BUILT TO LAST - Made of dense ABS plastic available in White or Brown and lines with a door sweep. Extendable to fit any door. Measures 29" without extensions and 3.85" tall. Easy to mount and move. WHAT'S IN YOUR AIR? - Don't let allergy season, pollution and weird smells get you down. Other filtration systems use lots of electricity, cost more, and still don't address the problem. Door Filter passively cuts contaminants and gives you the comfort of fresh air in your living space.