for These requirements cover Types B and BW gas vents and Types B and BW gas vent roof jacks intended for venting gas appliances equipped with draft hoods to burn only gas. Type B vents are also intended for use with other Category I appliances that specify they are for use with Type B gas vents. Gas vents are intended for installation in accordance with the Standards of the National Fire Protection Association for Chimneys@ Fireplaces@ Vents@ and Solid-Fuel Burning Appliances@ NFPA 211 and the National Fuel Gas Code@ NFPA 54. Gas vents are also intended for installation in accordance with the Department of Housing and Urban Development Mobile Home Construction and Safety Standards@ Chapter II of 24 CFR@ Part 280 and codes such as the BOCA Basic/National Mechanical Code@ the Standard Mechanical Code@ and the Uniform Mechanical Code.