20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack pumps-and-irrigation-supplies This is gentle on plants

This is gentle on plants and the yo-yo string is 60" in length

manufactured by Nordic Pure

May be used solely or in conjunction with all soil and hydroponic fertilizers

making transplanting less stressful to the clones

A VE115 3cfm (BVVVE115) vacuum pump is recommended for this system

20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack pumps-and-irrigation-supplies This is gentle on plantsImportant 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