16x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 1 Pack biological fertilizer If you’re ready for real

If you’re ready for real plant science

Sclerotinia sclerotiorum and Monilinia spp

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

It can also be used as a preventative control of broad mites

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

16x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 1 Pack biological fertilizer If you’re ready for realImportant 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