What type of vent must terminate 5 feet in vertical height above the highest connected draft hood or flue collar?

The correct response indicates that a Type B or L vent must terminate at least 5 feet in vertical height above the highest connected draft hood or flue collar. Type B vents, commonly used with gas appliances, are designed for venting devices that operate under negative pressure and are designed to safely carry flue gases from appliances. The 5-foot termination requirement ensures that the venting system effectively allows for the proper dispersion of flue gases, minimizing the risk of backdrafts, which can potentially lead to hazardous conditions in the appliance or the living space.

In contrast, while other types of vents may serve specific functions, they do not conform to this height requirement for safe draft termination. This criterion is essential in the code to enhance safety and efficiency in gas venting systems, ensuring that any gases emitted are properly vented away from the building and its occupants. Thus, a Type B vent is appropriately used in applications involving draft hoods and is compliant with NFPA 58 regulations.