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

The minimum vertical height for vent termination above the highest connected appliance flue collar is designed to ensure that combustion gases are effectively dispersed above the roofline, minimizing the risk of downdrafts and ensuring safety.

In this case, the correct minimum height is 5 feet. Terminating the vent at this height helps to reduce the likelihood of carbon monoxide or other harmful flue gases re-entering the building and allows for a clear path for combustion byproducts to leave the structure.

Additionally, maintaining this height recommends compliance with manufacturer instructions and safety standards intended to optimize venting performance across various appliance types, indicating that the vent serves its purpose effectively at this height. The specified height is crucial for ensuring that the vent is sufficiently above any potential obstructions, including the peak of the roof, which could impede exhaust flow.