Which type of venting material is used for oil furnaces?

The correct choice for venting material used for oil furnaces is Type L. This type of venting is designed to accommodate appliances that produce flue gases at higher temperatures and with a higher level of acidity compared to other types of venting materials. Type L vents are typically made of double-walled construction, with an inner layer that is resistant to corrosion from the byproducts of combustion, such as those found in oil-derived smoke.

Type L vents are specifically rated for the draft and the temperature characteristics associated with oil furnaces, making them suitable for safely guiding the exhaust gases outside while preventing heat loss and potential hazards. Additionally, they are often used with appliances that require a higher level of flue gas management, ensuring efficient operation of oil heating systems.

Other venting types may not be appropriate for oil furnaces because they could either not withstand the temperature or corrosion factors involved. For example, Type B is generally used for gas appliances and may not provide the necessary protection against oil combustion byproducts. Type M, while suitable for some low-temperature applications, lacks the necessary durability for high-efficiency oil furnaces. Finally, Type A is not commonly used in residential heating systems, particularly for oil applications.