16x20x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack DUCTWORK A manual flush valve allows

A manual flush valve allows you to clean the membrane

weight and density of flowers and fruits

Aphidius ervi will consume all types of larger aphids

Grow rooms

• Accurate heating within 1 degree

16x20x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack DUCTWORK A manual flush valve allowsImportant 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. We also carry 4 7 8 and 5 1 4 inch depth filters,