My gas oven is only partially heating while I run my evaporative cooler. I can also smell gas when both these appliances are on. My first thought is that perhaps the combustion air intake is partially blocked, and the air movement from the cooler is enough to suffocate the flame. However, I can't find where the oven draws combustion air from.

From where does an oven draw combustion air?

1 Answer 1


Home gas ovens draw oxygen from room air, and in turn add CO2, some CO, a little SO2 (from impurities and warning smell additive) and perhaps some nitrogen oxides to the room air. An externally vented exhaust hood helps get rid of these combustion products.

Most homes are not so air-tight that use of a stove or oven (other than on self-clean cycle) poses an issue. However, there may be local recommendations or requirements for air exchange, but "in the United States, venting most residential gas ranges and cooktops to the outside is not required."

So, if your evaporative cooler is vented, and the airflow interferes with the oven, you may need to operate the range-hood fan or crack a window (admittedly reducing the efficiency of the swamp cooler).

  • Thanks for the answer. How does the room air get into the actual oven? Intake duct somewhere near the bottom, I suppose? Jun 8, 2020 at 22:23
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    The door is not airtight. Air must move through the oven to prevent stratification of temperature. Jun 9, 2020 at 1:39
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    A home gas oven is relatively open on the bottom . There will be a vent on the top, usually at the rear to let the exhaust out . I often use this heat to keep some dish warm. The oderant is ethyl and/or methyl mercaptan, probably less than a ppm so the amount of SO2 it makes may not be notifiable. It should not make any CO. Jul 9, 2020 at 1:23

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