16x20x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 1 Pack Lamps Pro is backwards compatible with

Pro is backwards compatible with all current Hydro-X control / device modules

unlimited Zones

Also in the cartridge are six proprietary ingredients included as food sources that are all specific to within one tenth of a gram

Super light weight

and Rust Mite (Eriophyidae)

16x20x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 1 Pack Lamps Pro is backwards compatible withImportant 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 16x20x4 filter