draft hood

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.
References in periodicals archive ?
Built-in Horizontal To Vertical Draft Hood With Low Profile Design
Most gas water heaters have a draft hood on top of them that looks something like a bell.
You can do this by placing a lighted match under the outer edge of the draft hood.
The most recent addition to the line of hoods is the triple draft hood, found to be extremely efficient at handling the unique needs of large webs from 84-144 inches in width.
After running the furnace for five minutes to heat chimney, feel close to draft hood or vent pipes for exhaust leaks.