The Filtrete 20X20X4 AC Furnace Air Filter by 3M is a high-quality product designed for optimal performance in your air conditioner or furnace. With a MERV rating of 11 and made of durable polypropylene material, this filter ensures efficient filtration and clean air for your home. The limited warranty and included components of 2 filters make it easy to keep your system running smoothly. The white color and size of 20x20x4 make it compatible with various brands and easy to install. Trust in this 3M product to keep your indoor air clean and fresh.