16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 1 Pack Garden Hygiene and Safety but Torched proved me wrong

but Torched proved me wrong

• If using a 50-50 mixture of PowerVEG and standard T5 lamps

-Includes attached 8ft power cord and mounting bracket

These clever little pens make it easy to measure the nutrient uptake (pH)

16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 1 Pack Garden Hygiene and Safety but Torched proved me wrongImportant 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