2 furnaces- one chimney

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Old 02-12-03, 06:31 PM
jim37
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2 furnaces- one chimney

I have an oil furnace and a air tight wood/coal furnace. Can I have both of them hooked up to the same flue with only one inlet to chimney? Right now I use oil in fall then disconnect and use wood in winter. Thanks for any replies.
 
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Old 02-12-03, 08:07 PM
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jim37:

Regardless of whether or not it would work, most codes require that if more than one appliance is connected to a single chimney, it must be sized to carry the flue gas from all the appliances combined.
 
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Old 02-13-03, 06:09 AM
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I would recommend that you continue doing it the way you do now. The alternative would be to put dampers in each one and just close the damper when the unit is not in use. It is frowned on by oil furnace manufacturers to share the flue with another appiliance, but it happens all the time with water heaters. I am more concerned with draft problems than anything. You could consider powerventing the oil furnace. The new powerventers are much better than they were 5 years ago.
 
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Old 02-13-03, 04:03 PM
jim37
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Thanks for the feedback. Jim
 
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