20x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack steel plant stake Charcoal-based carbon filter loaded with

Charcoal-based carbon filter loaded with 30 lbs bituminous charcoal

handheld operation while taking PPFD measurements & ongoing data logging during power outages

The ballast will not attempt to restart a hot lamp for at least 15 minutes

stem structure

【 High-Efficiency Grow Light】300w with 952 pcs Samsung and Osram chips

20x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack steel plant stake Charcoal-based carbon filter loaded 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