Gas equipment shall not utilize combustion air from which spaces?

Gas equipment shall not utilize combustion air from which spaces?

• A. Kitchen
• B. Bedroom
• C. Bedroom or Bathroom
• D. Garage

Answer: (C)

Gas equipment needs a supply of fresh air for complete and safe combustion, and that air should come from a source that won’t compromise the occupants or introduce combustion byproducts into living spaces. Bedrooms and bathrooms are spaces designed for occupancy and often rely on controlled ventilation. If combustion air were drawn from them, it could reduce the room’s oxygen levels and allow combustion byproducts to backflow into the occupied area, especially if exhaust devices or fans create negative pressure. That’s why those spaces are not permitted as sources of combustion air. In practice, combustion air should come from outdoors or from a space that has appropriate openings to the outdoors (or to a non-occupied area) so that the air supply doesn’t impact the living areas. The other options are not the focus of this prohibition in this rule: kitchens and garages have their own considerations (kitchens may be vented for cooking, garages can contain vehicle exhaust), but the specific safety concern here is about using spaces intended for living and sleeping as air sources.

Gas equipment needs a supply of fresh air for complete and safe combustion, and that air should come from a source that won’t compromise the occupants or introduce combustion byproducts into living spaces. Bedrooms and bathrooms are spaces designed for occupancy and often rely on controlled ventilation. If combustion air were drawn from them, it could reduce the room’s oxygen levels and allow combustion byproducts to backflow into the occupied area, especially if exhaust devices or fans create negative pressure. That’s why those spaces are not permitted as sources of combustion air.

In practice, combustion air should come from outdoors or from a space that has appropriate openings to the outdoors (or to a non-occupied area) so that the air supply doesn’t impact the living areas. The other options are not the focus of this prohibition in this rule: kitchens and garages have their own considerations (kitchens may be vented for cooking, garages can contain vehicle exhaust), but the specific safety concern here is about using spaces intended for living and sleeping as air sources.