20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 2 Pack fans-ventilation-ducting Contains indole-3-butyric acid (IBA)

Contains indole-3-butyric acid (IBA)

A major Florida hospital was failing USP 797 testing with positive growth results of airborne Bacillus non-sporulating and airborne Aspergillus flavus mold spores

Grow Big Hydroponic

built-in hanging brackets to help with fitment and installation

Liquid Media Refill for Tissueponics Kit

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 2 Pack fans-ventilation-ducting Contains indole-3-butyric acid (IBA)Important 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,