Pamlico Air 10 in. W X 20 in. H X 1 in. D Fiberglass 4 MERV Air Filter is the perfect addition to your home's HVAC system. This high-quality air filter is made of durable fiberglass material and has a MERV 4 rating, which means it can effectively capture dust, pollen, and other particles to improve your indoor air quality. With its standard size of 10 x 20 inches, this 1-inch thick air filter is compatible with most air conditioning units and is easy to install. Keep your air clean and breathe easy with the Pamlico Air 10 in. W X 20 in. H X 1 in. D Fiberglass 4 MERV Air Filter.