20x20x4 (3 5/8) Pleated MERV 13 Air Filters 6 Pack new-releases * Vitamin C

* Vitamin C

They are designed to drive either halide or sodium bulbs properly with separate wire leads

Slightly compressed

or a supplemental full spectrum light for large flowering operations

Breathable fabric helps prevent heat stress and keeps you cool over long hours

20x20x4 (3 5/8) Pleated MERV 13 Air Filters 6 Pack new-releases * Vitamin CImportant 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