16x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 1 Pack biological fertilizer Winged adults have high dispersal

Winged adults have high dispersal and colonization rates allowing them to quickly establish populations in various growing media

SNS 217CTM Concentrate Spider Mite Control is made up of 100% pure rosemary botanical extract

If you’re ready for real plant science

• 4" to 12" sizes available—regular length & super Phat mini sizes

Sclerotinia sclerotiorum and Monilinia spp

16x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 1 Pack biological fertilizer Winged adults have high dispersalImportant 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