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Four square obeservation windows on the front & back door
Mix at time of planting or soil amendment
compact growth
Follow our grow schedule for the best results
Use the full Incubator™ system for optimal results
20x20x4 (3 5/8) Pleated MERV 12 Air Filters 2 Pack Electrical Components Four square obeservation windows onImportant 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
