20x25x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 6 Pack 9 CFM No brewing necessary

No brewing necessary

Always use equal parts of Athena Grow A & B to maintain proper mineral ratios

Trimbag Features:

There are two pockets in the top of the case specially made for the probes

20x25x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 6 Pack 9 CFM No brewing necessaryImportant 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