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Hvac Pro
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what do you mean by vented? if it has a concentric vent outside where it takes air in for combustion and shoots out the exhaust around it then no it is a sealed combustion unit and takes no air from the house lowering the humidity. post a pic of the exhaust termination and we may be able to help. most newer ones today are sealed combustion.
 

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Administrator
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if its using air from the house for combustion air, it can dry out the house.
 
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