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

The minimum height that vents should terminate above the highest connected appliance flue collar is 5 feet. This requirement is established to ensure proper venting performance and to prevent possible backdrafting or the recirculation of combustion gases, which can be hazardous.

Vent systems are designed to carry harmful gases like carbon monoxide safely outside of the building. If vents do not terminate at an adequate height, there is a risk that the gases could re-enter the living space, compromising indoor air quality and safety. By specifying a minimum termination height of 5 feet above the highest appliance flue collar, the code aims to create a safe separation between vent exhaust and the air drawn into the appliance.

Additionally, this height takes into account factors such as wind conditions and the surrounding environment that could potentially influence the venting performance. Vents that are too low may be adversely affected by wind patterns, leading to downdrafts that could carry harmful gases back into the home. Thus, the requirement for a 5-foot minimum height is critical for both safety and effectiveness in proper venting practices.