What type of vent is designed for appliances with draft hoods?

Type B Vent is specifically designed for style appliances that have draft hoods, such as certain gas appliances like water heaters and furnaces. This type of vent is constructed to accommodate the lower flue gas temperatures that are characteristic of draft hood appliances. They are typically made from double-wall construction, which provides better insulation and improves safety by preventing heat loss and reducing the risk of combustion hazards nearby.

The purpose of the Type B Vent is to ensure that flue gases are effectively vented outside while minimizing the potential for any backdraft or leakage into the living space. It is critical for maintaining proper draft and ensuring the efficient and safe operation of the appliances it serves.

Other types of vents, such as Type L Vent or Special Gas Vent, are designed for different applications or types of appliances, which may involve different operational characteristics and installation requirements. For instance, Type L Vents are used with appliances that produce higher flue gas temperatures and can also accommodate venting of oil and gas appliances, while Special Gas Vents are used for specific installations that may need custom configurations or features.