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Positive or Negative Pressure
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08-29-2014, 02:34 PM
sphelps
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Join Date: May 2006
Location: Lyalta, East of Calgary
Posts: 4,777
Probably positive. Do you know what the pressure switch is for? I assume it indicates a dirty filter and is installed between the fan and the filter on output of the fan meaning it will measure an increase in positive static pressure.
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