Where must any venting system for appliances terminate relative to each other?

The correct answer highlights the importance of proper venting system termination with respect to adjacent structures. Venting systems must be designed to ensure that exhaust gases disperse safely and do not enter the building or surrounding areas where they could pose a hazard.

Terminating the venting system at least 10 feet from adjacent structures helps to minimize the possibility of the exhaust fumes being drawn back into the building's windows, doors, or ventilation intakes, which could compromise indoor air quality and safety. This requirement promotes better airflow and more effective dissipation of gases, aligning with safety regulations and best practice standards.

For clarity, while venting systems can terminate above the roofline for additional clearance, this does not directly address the concern for nearby structures or potential re-entry of harmful gases into buildings. The distance of 5 feet mentioned in another option may not be sufficient to prevent issues associated with re-entrainment of the exhaust. Likewise, terminating below doorways or windows would likely create a serious safety hazard, as it would increase the risk of harmful gases entering occupied spaces.