20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack HPS and #8 Perlite (3/4"-1 1/3"

and #8 Perlite (3/4"-1 1/3" granules)

Always add fresh clean water to the reservoir first

This Bluetooth enabled electrode turns your Apple or Android device into a full-featured portable pH meter

Leaf Perforators

Dugout Cheech & Chong ""Dugout"" C&C Aluminum Green

20x20x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 1 Pack HPS and #8 Perlite (3/4"-1 1/3"Important 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