What additional height requirement exists for B-vent termination near vertical surfaces?

The correct answer indicates that a B-vent termination must be at least 2 feet higher than any vertical surface within a specified distance, typically 10 feet, from the vent termination point. This additional height requirement is essential for ensuring proper venting and avoiding potential issues related to back drafting and other venting problems.

By having the termination higher than the surrounding surfaces, the vent can effectively disperse combustion gases and prevent them from re-entering the building. This height is essential for maintaining a proper air flow pattern and ensuring effective exhaust of gases, which is crucial for the safety and efficiency of gas appliances.

Understanding the dynamics of venting in relation to surrounding structures helps in designing and installing HVAC systems that adhere to safety standards and prevent hazardous conditions resulting from improper exhaust venting.