Introducing Fresh Air

July/August 2005
A version of this article appears in the July/August 2005 issue of Home Energy Magazine.
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July 01, 2005
       Q. I am trying to find out how much fresh air is required to be introduced to an apartment by means of a forced-air furnace. I understand that the manufacturer will provide a spec with his furnace. However, I would like to know if there is some sort of chart showing how much fresh air to introduce in homes in the state of Washington.         If we don’t introduce enough, we run the risk of poor indoor air quality. If we introduce too much fresh air, are we going to decrease the efficiency of the furnace?        A.The furnace itself will not introduce air into your home, but an air inlet in the return duct will. I assume that this is what you are talking about, because your state code requires ventilation air to be distributed, and using your duct system is the easiest way to do this.         The state of Washington has some specific air flow requirements: 0.35 ACH or 15 CFM per person. Sometimes the number of people is taken by default to be the number of ...

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