20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack books-&-videos Propylene Glycol (PG) is one

Propylene Glycol (PG) is one of the main ingredients in all vape juices

to power its natural chemical reaction

The main Chamber holds up to 1/3 full (approx 2 lbs

Moisture content below 9% means the flower is more fragile and trim quality may diminish

20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack books-&-videos Propylene Glycol (PG) is oneImportant 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