20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack X Nutrients Grow Spray 1 Gal The 80 micron filter bag

The 80 micron filter bag ensures maximum airflow for extended periods while the balanced aluminum impeller keeps noise to a minimum

Its easy to clean and maintain

It is a high performance plant food with long shelf life elements that won't drop out

This is easily accomplished by simply increasing the Bloom

BULK should be used in the flowering stage to optimize flower production

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack X Nutrients Grow Spray 1 Gal The 80 micron filter bagImportant 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,