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computing air-volume : is "boiler room" big enough?
It's my understanding from reading on the web (please correct me if I'm wrong) that a 100,000 btu oil burner would require a boiler room 5000 cu ft or greater in order to have enough ambient combustion air to make sure none was being sucked back down the flue. Can the upstairs living area be added to the volume? Or is the computation limited to the specific room in which the boiler is located?