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Gas-fired condensing boiler is installed as a direct vent appliance

Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.

Combustion Furnaces

Guide describing combustion furnaces with selection and installation guidance.

Combustion Appliance Zone (CAZ) Testing

Guide describing how to conduct combustion appliance zone testing.

Gas-Fired Boilers - Code Compliance Brief

The intent of this brief is to provide code-related information about gas-fired boilers to help ensure that the measure will be accepted as being in compliance with the code. Providing notes for code officials on how to plan reviews and conduct field inspections can help builders or remodelers...