20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 12 Air Filters 4 Pack grow-light-reflectors CDFA organic certified

CDFA organic certified

Use at a rate of 1 tsp per 5 gallons when buds are forming and continue with every fertilizer application during the blooming cycle

Why Automatic

it spares you from a large mess while also reducing cleanup and maintenance times

providing optimum aeration and drainage

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement MERV 12 Air Filters 4 Pack grow-light-reflectors CDFA organic certifiedImportant 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,