Utilizes a moisture resistance, robust two-piece die-cut frame with diagonal supports bonded to the filter media pack for extra strength and to maintain proper pleat spacing. Filter frame iscoated with Aqua Coat treatment for added moisture resistance. Removes allergens including pollen, fine dust, smoke, pet dander, mold spores, pet dander, lint, and dust mites while helping to improve HVAC system efficiency for cleaner HVAC components. Offers up to 20 times more efficiency at capturing micro particles than ordinary fiberglass filters. Made in the USA.