20x25x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 1 Pack Monitors & Timers Humboldt Nutrients Master A&B is

Humboldt Nutrients Master A&B is a premium two-part fertilizer program designed for all plants made with non-toxic

Easy one-button calibration

carrier granules — 99%

instructions and hardware for moving two lights with the enclosed Motor

• Installation instructions

20x25x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 1 Pack Monitors & Timers Humboldt Nutrients Master A&B 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. If you are replacing a 4 3 8 depth 20x25x4 filter