DP MAX40 Pleated Air Filters The Bio Pure Max pleated air filter is designed with a consistant pleat shape on predetermined centers causing dirt to collect evenly over the entire surface of the media. Fully utilizing every square inch results in a slow steady rise in resistance for maximum dust, dirt, pet dander and dust mite holding capacity. MERV 7 Rating 25%-30% Efficient Cotton / Polyester Blended Media Moisture Resistant Beverage Board Double Wall Frame |