Improve your home's air quality with the assistance of this Honeywell Ultimate Allergen Air Filter (12-Pack). Capturing microscopic allergens, bacteria, disintegrated feces, tobacco smoke, insecticide dust, lead dust, mold spores and more, its electrostatic charge and large surface area of pleated material improve the filter's dust-holding capacity. It features a clay-coated, moisture-resistant frame and captures particles as small as 1 micron. Each filter lasts 90 days.