20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack special-order - Easy to use CO2

- Easy to use CO2 enrichment or CO2 ventilation controller

Pyrex glass tube

The blend promotes faster germination

herbs and more

soft dimming capabilities

20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack special-order - Easy to use CO2Important 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