Trapped Gas

Elovitz, David M.
September 2007
Heating/Piping/Air Conditioning Engineering;Sep2007, Vol. 79 Issue 9, p16
The article examines the problem with the heating system in a condominium unit. Firefighters had detected carbon dioxide in the apartments above and below the affected unit. Opening the ceiling and taking down and inspecting this unit's flue piping released about a half gallon of water. It was concluded that snow and water have accumulated in the pipe during winter storms when the heater was off, and the piping sagged so that the horizontal pipe formed a trap at the elbow.


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