No more guessing! An easy-to-use, easy-to-read gage to monitor filter media loading so that filter media may be changed when needed. 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.
The GeneralAire G99 Air Filter Gage may be calibrated in a negative pressure range from 0.1 to 0.4-inch w.c. When properly calibrated in this range a vacuum increase of 0.10 to 0.15-inch w.c. will indicate a filter change is necessary. The dial design is easy to read and interpret when the filter needs to be changed. Easy to calibrate for new, clean media. Easy installation. Built-in filter screen removes dust from sampled ambient air to keep gage clean. May be mounted remotely up to 10 feet from the monitoring location (with an extension kit). Easy to disassemble/assemble for service.
OPERATION: Install a clean filter and run the blower at the highest speed. With a small screwdriver adjust the calibration screw, on the face of the gage, to put the pointer in the clear area in the center of the green “FILTER IS CLEAN” range.