Generalaire G99 Furnace Air Filter Change Indicator

Generalaire G99 Furnace Air Filter Change Indicator
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Price: $15.99
Manufacturer: Generalaire
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The G-99 Air Filter Gage provides a visual indication of the need to replace the air filters in forced air heating and cooling systems. The gage 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 gage, 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.
EASY to install. Drill one hole...that's it!
No more guessing  how dirty the your furnace filter is. Now you can change "right on time".

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