20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack post harvest Mini-Sachets - 1-2 sachets per

Mini-Sachets - 1-2 sachets per plant depending on infestation levels

and commercial agriculture

running 12 hours per day with both VEG and BLOOM switches during the flowering and fruiting stages

This pump has 1 impeller

20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 6 Pack post harvest Mini-Sachets - 1-2 sachets perImportant 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. If you are replacing a 4 3 8 depth 20x20x4 filter