Backdrafting


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Backdrafting

Potentially hazardous condition in which the exhaust from combustion appliances does not properly exit the building. This can be due to a number of factors including a blocked flue or a pressure difference within the building.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
If occasional backdrafting is a problem in your home, the strip should detect it.
Erik tests for backdrafting in the water heater flue as well by holding a flame or a smoke stick next to the draft diverter (Photo 2).
2 Backdraft test: With all doors and windows closed and all combustion appliances turned on, the auditor tests for backdrafting at a naturaldraft gas water heater.
Backdrafting occurs when the combustion gases can't go up and out flues and chimneys because outdoor air is already flowing down them (Fig.
B BACKDRAFTING BACKDRAFTING is a condition in which air flows down a flue or chimney rather than up, and combustion fumes can't flow out.
But if it's a furnace or water heater that's backdrafting, you can be in serious--even deadly--trouble.
Backdrafting is a threat to the health of your family and your house.
Backdrafting became an increasing problem after the energy crisis of 1973 when gas lines and rising fuel prices made energy conservation a high priority.
Fortunately you can easily test your furnace and water heater for backdrafting. Set up a worst-case scenario by closing up your house as you would during cold weather or during hot weather when the air conditioner is running full time.
If the flame or smoke is not drawn to the flue, or is blown away from it, you have a backdrafting problem.
Even replacing a couple of old, leaky windows with new, tight ones can upset the sometimes delicate balance of airflow through your house and cause backdrafting.
* Periodically, conduct a backdrafting check as detailed on p.