Intertherm Disposable Filter 16in x 20in x 1in. These Heater Accessories from the pioneers at Intertherm are made with precision construction and high-quality materials for performance and reliability. Designed for quick and simple installation this Intertherm Disposable Filter will get your furnace up and running again. Follow manufacturer recommendations for proper fit and installation information. For use with electric furnaces the Intertherm Disposable Filter - 16" x 20" x 1" is a quality choice that will keep you warm throughout the winter. Features of Intertherm 668934R Disposable Filter 16in x 20in x 1in Filter Size: 16" x 20" x 1" For E4EB/E6EB series furnaces For use with electric furnaces Follow manufacturer recommendations for proper fit and installation information Package Contents: Intertherm 668934R Disposable Filter 16in x 20in x 1in Intertherm 668934R: Disposable Filter 16in x 20in x 1in