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draft hood

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draft hood [′draft ‚hu̇d]
(engineering)
A device used to facilitate the escape of combustion products from the combustion chamber of an appliance, to prevent a backdraft in the combustion chamber, and to neutralize the effect of stack action of the chinney or gas vent on the efficient operation of the appliance.
draft hood
1op of a flue to prevent downdrafts.
2. An open enclosure over a gas-fired furnace. Serves to create a stack effect which more readily mixes the exhaust gases with air and directs the mixture to the chimney; prevents back drafts from getting into the furnace.
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1 FLUE DRAFT TESTS FOR FURNACES NOT EQUIPPED WITH DRAFT HOODS.
Field testing residential fan-assisted gas-fired furnaces--Part I: ... by Fleck, B.A.; Arnold, S.C.; Ackerman, M.Y.; Dale, J.D.; Klaczek, W.E.; Wilson, D.J. / ASHRAE Transactions
For a gas heater, separate the vent pipe from the draft hood which should life off after you remove the sheet metal screw holding it.
Installing A Hot Water Heater by Erica Bosworth / Home based business community
Most gas water heaters have a draft hood on top of them that looks something like a bell.
Q & A: carbon monoxide--what you can't smell will hurt you by Savage, Isaac / New Life Journal
 
 
 
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