What is the minimum vertical height that vents should terminate above the highest connected appliance flue collar?

The minimum vertical height that vents should terminate above the highest connected appliance flue collar is crucial for ensuring proper venting and preventing the backdraft of combustion gases. Terminating the vent at a height of 5 feet above the highest flue collar helps facilitate adequate draft, thereby ensuring that flue gases are effectively expelled from the structure.

This height allows enough elevation to reduce the possibility of downdrafts caused by wind or changes in atmospheric pressure, which can compromise the proper operation of the appliance. It also helps in maintaining a safe distance from potential sources of ignition or openings through which gases could re-enter the building. Compliance with this requirement is essential for safety and efficiency in HVAC systems.

Understanding the importance of proper vent termination height underscores the need for following local codes and manufacturer's specifications to ensure both safety and optimal performance of heating appliances.