The number will be diff erent from booth to booth, but that does not matter . T his is just a baseline setting. Wherever the red fluid stops is where you will place your Green arrow. In this example, the red fluid stopped at .25 inches of water column. So because we know our filters are rated for .5 inches of water column, and we know that with clean filters the fan is drawing .25 inches of water column, we simply add the two numbers together to tell us where the filters will pack out. .25 inches of water + .5 inches of water = .75 inches of water total Step 6 - Set Your Change Filter Arrow Now that the baseline is set, measure up the scale .5 inches of water to allow for your filters to pack out and that is where you will place the Red arrow.
End Pressure (Change Filters)
Starting Pressure (Fan on with Clean Filters)
At this point, your manometer is set up and ready to use. You should never need to move the arrows once they are placed. Always check the manometer before turning the fan on to ensure the red fluid is sitting on the 0 mark. If the fluid is not on 0, simply turn the “Zero Set” knob to adjust the fluid to zero before starting the fan.
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