Which type of venting uses a barometric damper?

Type B venting is specifically designed for appliances that produce flue gases, such as gas appliances and certain vented appliances. The inclusion of a barometric damper in Type B venting systems allows for the automatic adjustment of airflow within the vent. This is vital for maintaining proper draft conditions, preventing backdrafts and ensuring safe and efficient venting of flue gases. The barometric damper helps to regulate the pressure difference between the inside of the venting system and the outside environment, which is essential for the performance and safety of gas-burning appliances.

In contrast, other types of venting may not incorporate a barometric damper due to the different requirements and operational characteristics of the appliances they serve. For instance, Type H and Type BW venting are typically designed for different applications and do not require the same level of pressure regulation as Type B. Type L venting systems, often used for oil appliances, also do not employ barometric dampers and focus more on the specific needs of oil combustion venting. Therefore, the specific association of Type B venting with the use of a barometric damper makes it the correct answer.