20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 4 Pack grow-light-ballasts 5% Water Soluble Nitrogen

5% Water Soluble Nitrogen

and beneficial wildlife

denser & more efficient/resilient root mass

Great lumen output for high PAR values

1 cup of Geoflora BLOOM weighs approximately

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 4 Pack grow-light-ballasts 5% Water Soluble NitrogenImportant 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,