20x25x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 2 Pack rock-bottom Porthole cover fits all of

Porthole cover fits all of our premium reservoir covers

which stays wetter

Mounts horizontally or vertically to prevent backflow and debris from entering ducting

Includes (2) EZ Turn duct clamps

Philips recommends that you do not operate the lamp for less than 3 minutes or this can cause ignition issues

20x25x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 2 Pack rock-bottom Porthole cover fits all ofImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3 8 depth 20x25x4 filter