20x20x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack sprayers and maximum resistance to disease

and maximum resistance to disease and fungal attack

horticultural oils and yellow sticky traps

The 2' 24W T5 fluorescent tube and built-in reflector provide ample 6400K light to your plants

Aggressive Vegetative Phase – 5-10 ml/gallon

Use as a sweetener or to feed beneficial microbes with the carbon energy they thrive on

20x20x4 (3 5/8) Pleated MERV 13 Air Filters 2 Pack sprayers and maximum resistance to diseaseImportant 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. If you are replacing a 4 3 8 depth 20x20x4 filter