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Ships within 48 hours · Estimated delivery Sep 11 - Sep 16
Free of added nitrogen
New LED powered Mini Greenhouse Kits for the upcoming season
These clever little pens make it easy to measure the nutrient uptake (pH)
but Torched proved me wrong
No rinse required
16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 1 Pack Garden Hygiene and Safety Free of added nitrogenImportant 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 16x20x4 filter