20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 4 Pack lighting-&-electrical-components Duct Opening Diameter: 6 inches

Duct Opening Diameter: 6 inches | Front Plate Size: 9” | Finish: Powder Coat

Mounting Bracket for 601130 and 601165

The only lighting controllers featuring industrial-grade ballast relays

so you will not introduce diseases into the garden or greenhouse

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 4 Pack lighting-&-electrical-components Duct Opening Diameter: 6 inchesImportant 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,