20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack grow-light-reflectors Guard ‘n Spray can be

Guard ‘n Spray can be used through the entire vegetative phase and early bloom stage

Enzyme production from the bacteria helps plants utilize fats and oils and better break-down carbohydrates

This fixture is Commercial grate so its design quality and durability is second to none

The combination of these two horticultural substrates

wear and tear-resistant material for cylinder and piston

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 4 Pack grow-light-reflectors Guard ‘n Spray can beImportant 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,