View Full Version : Low Static pressure
05-10-2007, 09:39 AM
Can anyone explain to me what it means, installer said it is about half from what it supposed to be. I am getting a new furnace put in and tech said that it could be caused by different reasons but he'll be able to take care of it with a new furnace. Any suggestions?
Depends on where he found low static.
The furnaces fan motor can deliver the correct air flow,up to a certain static(in your case that's the resistance to air flow of all components external to the furnace),so usually you find higher static then the motor can wotrk against is a problem,not low static.
Your cooling coil is external to the furnace,if it's dirty and cloged,less air will pass thru it,so due to less air flowing the static will be low in the air stream after the coil,but very high between the furnace and the coil.The equipment will not get the minimum air flow required.
If everything is clean and working,low static ,would only be a problem ,if the furnace delivered more then the required air flow.This could easily be solved by adding a damper to increase the static(resistance),so the furnace will move less air down to the required amount.
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