20x25x4 (3 5/8) Pleated MERV 13 Air Filters 6 Pack pumps-and-irrigation-supplies which causes the perlite to

which causes the perlite to pop in a manner similar to that of popcorn

dual-zone configuration

Protective gloves should be worn

• Destroy root pathogens and the food sources they feed on

Rock Phosphate and Potassium Sulfate

20x25x4 (3 5/8) Pleated MERV 13 Air Filters 6 Pack pumps-and-irrigation-supplies which causes the perlite 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 20x25x4 filter