A chimney for a low-heat appliance must withstand a continuous flue gas temperature not exceeding how many degrees Fahrenheit?

A chimney for a low-heat appliance must withstand a continuous flue gas temperature not exceeding how many degrees Fahrenheit?

• A. 900
• B. 1100
• C. 1000
• D. 1200

Answer: (C)

Chimney components are chosen based on how hot the flue gases stay over time. The important rating is the continuous temperature the chimney must withstand. For a low-heat appliance, the exhaust isn’t expected to stay hotter than about 1000°F, so the chimney is designed and rated to handle that continuous temperature. Choosing a rating well below that would risk overheating the chimney with normal operation, while higher ratings (like 1100°F or 1200°F) are intended for higher-heat appliances and require different construction or protection. So the safe, appropriate continuous limit for a low-heat appliance is 1000°F.

Chimney components are chosen based on how hot the flue gases stay over time. The important rating is the continuous temperature the chimney must withstand. For a low-heat appliance, the exhaust isn’t expected to stay hotter than about 1000°F, so the chimney is designed and rated to handle that continuous temperature. Choosing a rating well below that would risk overheating the chimney with normal operation, while higher ratings (like 1100°F or 1200°F) are intended for higher-heat appliances and require different construction or protection. So the safe, appropriate continuous limit for a low-heat appliance is 1000°F.