20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack LUXX Bar Grow Chunks are a larger

Grow Chunks are a larger version (3/4" square) of the popular Grow Cubes

Mini 3P Male and Female IP65 dimming ports

• Promotes vigorous plant growth and greater yield through a proprietary blend of iron chelates that keeps iron available even

Water Soluble Hardener is designed for cool temperature climates

20x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack LUXX Bar Grow Chunks are a largerImportant 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