Which of the following best describes venting for fuel-burning appliances?

Venting for fuel-burning appliances is critical to ensure safety and efficiency in their operation. Proper venting must ensure that combustion gases are safely expelled from the appliance to the outside environment. This is achieved by adhering to specific airflow requirements that are based on the specifications of the appliance being used. Each appliance has unique ventilation needs that depend on factors such as its capacity, type of fuel, and the building's layout.

When the venting matches the manufacturer's guidelines, it helps prevent the buildup of hazardous gases, like carbon monoxide, and ensures that the appliance operates efficiently. This proper airflow protects occupants' safety and contributes to the appliance's longevity. Therefore, the requirement that venting "must ensure proper airflow based on appliance specifications" accurately captures the essence of effective venting practices for fuel-burning appliances.