What type of vent must oil-burning appliances be listed and labeled for venting with?

Oil-burning appliances must be vented using Type L venting. Type L venting is specifically designed for the safe discharge of flue gases from oil-fired appliances. This type of venting is constructed to handle higher temperatures and the corrosive byproducts produced by oil combustion, ensuring safe operation and preventing hazards such as flue gas leakage or backdrafting.

In contrast, Type B venting is intended for use with gas appliances, making it unsuitable for oil applications. Type K is not a recognized category for venting specific to these appliances, while Type A is generally associated with a different venting system that is also not designed for oil. Therefore, for the safe and effective venting of oil-burning appliances, Type L is the required and correct choice.