16x20x4 (3 5/8) Pleated MERV 10 Air Filters 1 Pack -monitors-&-timers Bluelab® pH Controller Connect™

Bluelab® pH Controller Connect™

an 8 oz package makes up to 800 gallons and a 2 lb package makes up to 3200 gallons

grease & oil

Humidity Deadband:                              5%

16x20x4 (3 5/8) Pleated MERV 10 Air Filters 1 Pack -monitors-&-timers Bluelab® pH Controller Connect™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 16x20x4 filter