E-Z Filter Base allows for easy access to service the filter for both furnaces and air handlers in either up flow or down flow applicatons. Can be used with disposable, electrostatic, or washable filters. (Filter not included) Features include no panels or door to remove, simply lift access door and remove filter. Use standard size 1″ or 2″ filters. Helps keep Evaporator Coils clean. Customized professional installation.