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GeneralAire G-99 Air Filter Gage

SKU: G-99
MPN: G-99

The GeneralAire G-99 Air Filter Gage provides a visual indication of the need to replace the air filters in forced air heating and cooling systems. An easy-to-use, easy-to-read gage to monitor filter media loading so that filter media may be changed when needed. No wiring needed, only a 3/8 drill bit. The gauge is installed between the blower and the filter, where a slight vacuum exists due to the air-flow resistance of the air filter. Air flowing into the gauge, around the calibration screw,lifts a vane in proportion to the negative pressure in the blower compartment. As the air filter loads, the vacuum increases, raising the vane to indicate a filter change is necessary.
Products specifications
Model Number G-99