20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 2 Pack Controller or a workplace that is

or a workplace that is less distracting

½" fill/drain fitting

Can be used to calculate the exact amount of light needed based on the PPFD to enhance growth rates and to save energy

avoid applying high-phosphorus fertilizers or fungicides at the same time as inoculation

20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 2 Pack Controller or a workplace that isImportant 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,