This Filtrete air filter is a great addition to any furnace with a size of 20 x 30 x 1, it is easy to install and provides excellent filtration for indoor air quality. The white color and sleek design make it a stylish choice for any home or office. It is designed for use in furnaces and is made by the trusted brand Filtrete. This air filter is perfect for those looking to improve their indoor air quality and breathe easier.