16x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 2 Pack lighting-&-electrical-components Air root pruning is a

Air root pruning is a key component to a healthy fibrous root ball

AZOS Red Liquid is ideal for cloning and plant propagation

Virtually eliminates transplant shock & stress

The NCCS system allows for precision control of all devices in the grow room through its simple and intuitive APP

16x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 2 Pack lighting-&-electrical-components Air root pruning is aImportant 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,