20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 13 Plus Carbon 4 Pack Grow System/ Trays/ Reservoirs The newest addition to our

The newest addition to our Grow1 line of Dry Racks

the backdraft damper is made of sturdy galvanized steel and features two rings of outer rubber gaskets

Verticillium sp and White Mold

Includes PGZ18 5kV socket

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 13 Plus Carbon 4 Pack Grow System/ Trays/ Reservoirs The newest addition to ourImportant 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,