20x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 6 Pack Grow Light Ballasts punctillum are mobile predators with

punctillum are mobile predators with females feeding quickly to sustain egg-laying

Silicone vacuum pad

Quick Cal solutions to calibrate pH and conductivity all at once with a single solution

7"  Vented NanoDome for optimizing the light over your grow tray

20x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 6 Pack Grow Light Ballasts punctillum are mobile predators withImportant 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