20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack Drying Racks Can also be used to

Can also be used to correct the most common cause of crop failure—the buildup of nutrient salt deposits in soil or soilless grow media

• Long lumen maintenance—90% output at 70

Even light distribution

effectively stopping the spread of mildew upon application

20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack Drying Racks Can also be used toImportant 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