20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack lighting_accessories Active Air Premium Ducting is

Active Air Premium Ducting is perfect for the air-cooled reflectors in your grow room

Through this amino acid chelation process

Once up to three times a week

reliable operation throughout the grow cycle

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack lighting_accessories Active Air Premium Ducting isImportant 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,