20x25x4 (3 5/8) Pleated MERV 10 Air Filters 1 Pack bio soil The dimmer knob allows growers

The dimmer knob allows growers to change the brightness level of both the veg and bloom lights from 0-100% allowing you to obtain perfect growth performance

As with all Nordic Pure filters

protect potency

0 Adjust-a-Drive is supplied with adjustable switch stops

Zenport SH7005-ZD Foldable Aluminum Cold Frame Greenhouse is suitable for seed planting and protecting fragile sprouts from the elements

20x25x4 (3 5/8) Pleated MERV 10 Air Filters 1 Pack bio soil The dimmer knob allows growersImportant 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