What is a requirement for exhaust vents on gas appliances?

Exhaust vents on gas appliances must terminate in the exterior atmosphere and be positioned away from windows and doors to ensure safety and proper venting. This requirement is based on the need to prevent harmful gases, such as carbon monoxide, from entering living spaces. Gas appliances produce flue gases during operation, and direct exhaust to the outside prevents these gases from re-entering the home.

Proper positioning of the vent away from windows and doors is crucial because it minimizes the risk of flue gases being drawn back into the building through open windows or doors, especially when the wind blows. This is a fundamental safety measure to protect occupants from exposure to toxic exhaust.

The other options do not align with safety standards established by regulations. Allowing vents to terminate inside a building or in an attic would pose significant health risks, as it could lead to the accumulation of harmful gases in enclosed spaces. Additionally, a vent must not have a convoluted path; it needs to be properly directed to ensure optimal function and safety.