20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 14 Plus Carbon 2 Pack Fertilizer Daisy chain capable: 6

Daisy chain capable: 6

If you are dealing with an infestation

smooth taste in the finished product and facilitating the uptake of nutrients by the plants

Do not use at full strength to avoid deterioration of equipment components

you can speed up humidity retention and improve overall substrate colonization

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 14 Plus Carbon 2 Pack Fertilizer Daisy chain capable: 6Important 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,