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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 Appliance Zone (CAZ) Testing

Guide describing how to conduct combustion appliance zone testing.

Gas-Fired Tankless Water Heaters

Guide describing the installation of a tankless hot water heater to provide domestic hot water that is heated on demand without the standby losses associated with tank storage water heaters.