The Honeywell Elite Allergen Filter is made of a reinforced pleated media designed to capture particles down to 0.3 microns, 300x smaller than the diameter of a human hair. Its large surface area improves the efficiency, providing a greater dust-holding capacity and lower energy costs. The filters electrostatic charge helps attract particles that would otherwise pass through. Housed in a recyclable moisture-resistant frame, the Honeywell Elite Allergen Filter is effective against the following contaminants dust/lint, airborne dust mite debris, pollen, pet dander, mold spores, bacteria, microscopic allergens, virus carriers and odor, as well as most smoke and smog particles.