How far must the horizontal termination point for a mechanical draft system be from an interior corner formed by two walls?

The correct answer indicates that the horizontal termination point for a mechanical draft system must be located at least 3 feet from an interior corner formed by two walls. This distance helps ensure that the exhaust gases from the mechanical draft system are vented away from the structure efficiently and do not get trapped or redirected back into the living space, which could pose safety issues such as carbon monoxide buildup.

Placing the termination point too close to an interior corner can cause airflow obstructions, leading to improper venting and potential system failure. Furthermore, such regulations are typically in place to comply with safety standards and codes, which aim to minimize the risk of hazardous gases entering occupied spaces.

The specified distance of 3 feet provides enough clearance to mitigate any possible negative effects from the draft system while still maintaining effective operation of the equipment. Therefore, adhering to this requirement is crucial for both safety and efficiency in HVAC applications.