16x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack pumps-&-irrigation Hydrofarm Brand “Other” Brands Specifically

Hydrofarm Brand “Other” Brands Specifically made for use with centrifugal fans

This high-speed fan is suitable in applications where maximizing airflow is the primary objective and a louder noise level is tolerable

A continuous shower of CO2 directly onto your plants is the most efficient way to deliver CO2

and easy to fill

Lite Controller (Sold Separately)

16x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack pumps-&-irrigation Hydrofarm Brand “Other” Brands SpecificallyImportant 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,