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To: nasdaqian who wrote (58203)1/16/2001 5:09:52 PM
From: Ish  Read Replies (1) | Respond to of 71178
 
<<The relative humidity would go down because the cold air expands due to the radiant heat and warm air can hold more moisture than cold, but the absolute humidity would be the same. No?>>

No, because the cold air entering the house has less humidity than the warm air already in the house.

<<I don't see how outside combustion air would change anything except as I mentioned. >>

You're sending the outside air up the chimney instead or the already warm and humidified air from the house.