How far should a vent terminate from a window if the appliance firing rate is 65 MBtu/h?

The appropriate termination distance for a vent, particularly for an appliance with a firing rate of 65 MBtu/h, is critical for ensuring safety and efficiency. For appliances that produce higher BTU outputs, there is increased concern about combustion gases and their potential impact on the environment and indoor air quality.

The regulation specifies that the vent should terminate at a distance that minimizes the risk of flue gases entering nearby windows. In the case of a 65 MBtu/h appliance, the requirement is that the vent should be at least 12 inches away from any window or door. This helps to ensure that any gas produced has sufficient distance to disperse effectively and does not risk re-entering the building through open windows, which could lead to hazardous conditions.

Choosing a distance of 12 inches also adheres to safety regulations outlined in the relevant standards, which prioritize both the effective functioning of the appliance and the safety of the occupants. Lower distances, such as 6 or 10 inches, would not provide enough clearance to mitigate these safety concerns properly. Thus, for this specific firing rate, 12 inches is indeed the correct and most appropriate termination distance for a vent.