16x20x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack DUCTWORK • 100% RHP Certified CocoCoir

• 100% RHP Certified CocoCoir

The controller can be mounted to a wall or grow tent

All materials are safe for dry food and herb storage (but not long term home canning—please do not use these for canning)

NOTE: Grow1 sensors DO NOT WORK with GROW1 weather stations

16x20x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack DUCTWORK • 100% RHP Certified CocoCoirImportant 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,