TYPE B GAS VENT

Test Standard: UL441

Scope: 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. 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.

Application: NON-CONDENSING APPLIANCE (84% or less efficiency), Listed gas appliances with draft hoods and other Listed gas appliances specified for use with Type B Gas Vent or ANSI Z21 Category I appliances
Maximum Gross Stack/Vent temperature: 470° F

Stack/Vent system pressure: Negative, (Less than -0.02” W.C.)

General Constructions: Inner (Aluminum), Insulation (1/4 to 1” air), Jacket (aluminized/Galvalume steel jacket)

Sizing: NFPA-54, ICC, IFGC, UMC Gas Vent Tables

TYPE B GAS VENT – Texas Draft