20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 12 Pleated Plus Carbon 1 Pack 9 CFM Each silencer is built with

Each silencer is built with a solid galvanized steel body that is corrosion-resistant and can withstand extreme temperature changes

Complete Nutrient Delivery – When used with the full 4-part system

The Max-Fan® is the first fan that has been developed with a Computational Fluid Dynamics (CFD) program

Phantom 315W features:

20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 12 Pleated Plus Carbon 1 Pack 9 CFM Each silencer is built 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. We also carry 4 7 8 and 5 1 4 inch depth filters,