Air Bear 20x25x5 (4 7/8) Replacement 259112-102 MERV 12 Air Filters 1 Pack DUCTWORK Rock phosphate helps transfer energy

Rock phosphate helps transfer energy from one part of the plant to another

The controller also features a dosing relay

Increase the longevity and effectiveness of your aging tools by investing in quality replacement parts

which has been carefully studied to maintain an even oxygen level inside of it

Features platinum TDS/EC sensor and thermister

Air Bear 20x25x5 (4 7/8) Replacement 259112-102 MERV 12 Air Filters 1 Pack DUCTWORK Rock phosphate helps transfer energyImportant 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 3 8 and 5 1 4 inch depth filters,