This Source 1 S1-FM413 Filter Replacement Media is a high-quality, pleated filter designed for furnace applications. It features a MERV 13 rating, effectively capturing allergens and providing mold resistance. Made with synthetic filter media and a paper frame, it offers reliable filtration with true HEPA technology. The filter is white in color and is intended for a 3-month lifespan. This open box, like-new item includes one filter unit and is suitable for HVAC systems requiring a durable, efficient air filter.