Fireplace smoke through heating duct


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Old 11-13-06, 09:05 AM
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Fireplace smoke through heating duct

I have a 40 y.o house. This year when I burn a fire in the fireplace (central chimney) and the heater (oil heat) comes on there is heavy smoke smell upstairs.

Any ideas?
 
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Old 11-13-06, 09:41 AM
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Where is the furnace located in regards to the fireplace ?? Are they very close to one another ?? Also is there a return vent near the fireplace ??
 
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Old 11-13-06, 09:49 AM
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Have some one or you get up on the roof and check the flues out for both of them.

ED
 
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Old 11-13-06, 09:52 AM
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Fairly close

The furnace is in the basement. They (fireplace and furnace) share a chimney though each have their own flue.

I'm not sure about return air. I figure there is a return air vent in the basement as well.
 
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Old 11-13-06, 09:53 AM
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Is the fireplace in the basement also ?
 
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Old 11-13-06, 09:54 AM
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Could one of the flues be blocked?

I don't have the same sympton when fireplace is not burning.
 
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Old 11-13-06, 09:55 AM
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Fireplace is on first floor (not in basement)
 
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Old 11-13-06, 10:10 AM
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If you have been working on the home to like seal it up. The oil burner comes on it can pull air from the fireplace for its flue draft. If you can open a window by the furnace when it comes on and see if it dont stop the smell. Or when no fire in the fireplace and the furnace comes on. Do you feel cool air around the fireplace. Like the oil burner is trying to get air from it??????
Or the fireplace can pull air from the furnace. I have had when a home gets to tight where the fireplace on the first floor will pull air from the furnace flue. And then make the basement colder.

ED
 
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Old 11-14-06, 04:06 AM
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HHaven't been trying to seal house

I haven't really been trying to seal the house, but I understand the points about the negative air pressure.

I noticed that the mortar around the pie plate for the furnace flue is cracked. Is it possible that smoke is coming back down the furnace flue?
 
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Old 11-14-06, 05:05 PM
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Not sure what you mean here. But it sure can be. If you smoke blow some around it when all is on.
 
 

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