heating duct clearance

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Old 11-24-99, 02:36 PM
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What is the required clearance between wood framing and forced air heating ducts?
 
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Old 11-24-99, 02:37 PM
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Justin, If your talking about the duct work that sends the conditioned air into the house, their needs to be no clearance. Now if your referring to the flue that removes the exhaust gases out of the house, single wall flue has a 4" to combustible materials clearance, and double wall flue has a 1" to combustible materials.
Hope this helps, Bill
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Old 11-24-99, 02:38 PM
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One inch clearance to combustible material for supply (warm) air

I would double check the above answer - sounds mighty close to me for the B (double wall) vent.
 
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Old 01-02-08, 03:20 AM
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1" clearance to combustible materials is correct when using b vent (double wall).
 
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Old 01-02-08, 04:21 AM
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1" for B-Vent - see pp 3 here:

http://www.ventingpipe.com/catalogs/simpson/bvent.pdf
 
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