What type of vent connector is recommended when located in an attic serving an appliance?

When selecting the proper vent connector for an appliance located in an attic, Type B Vent is recommended. This type of vent is specifically designed to handle the exhaust gases from gas appliances and has been constructed to provide safe and efficient ventilation. Type B Vent is double-walled, which helps maintain a safe temperature and minimizes the risks of fire by reducing the surface temperature of the vent and its proximity to combustible materials in the attic.

Moreover, Type B Venting systems are typically applied when the vent run is longer or where the vent is exposed to cooler temperatures, as is often the case in attic spaces. This type of vent can also provide adequate clearance from combustibles, ensuring safety and compliance with regulatory standards.

In contrast, the other types of vents may serve specific applications but do not have the same level of safety and efficiency characteristics suited for attic installations serving appliances. Type A, for example, is meant for appliances venting directly through walls, while Type C and Type D are intended for different applications and may not offer the same protections against fire hazards in an attic space.