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
Snap the new draft hood onto the water heater and secure it with sheet metal screws.
When the burner has been running for at least one minute, move an incense stick around the draft hood.
Most gas water heaters have a draft hood on top of them that looks something like a bell.
Due to the inclusion of the standard draft hood, we are left to chance when it comes to safely operating this appliance.
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 a minute, move a smoking match around the edge of the draft hood (Photo 7) on top of the heater.
Shove it tightly over the draft hood and anchor it with three 3/8-in.
Natural draft appliances are easy to recognize because they always have some sort of draft hood in the vent system (Figs.
Look for signs of combustion gas spillage around the draft hood (Figs.
After a minute, move a burning match around the draft hood on top of the heater (Photo 6).