The Type B CHIMNEY B-VENT designation is assigned to gas venting systems that meet the safety requirements of Underwriters Laboratories, Inc. The AmeriVent all-metal, double-wall gas vent is listed as Type B by Underwriters Laboratories, Inc. and is approved for such residential and commercial applications as Category 1 water heaters, boilers, furnaces, space heaters, or wall heaters. UL-approved Type B gas vent products form a continuous passageway from an approved gas appliance to the termination of the vent above the roof of the structure.
For a perfect connection, all of the chimney B-vent connector components and flexible lengths feature the proven AmeriVent snap-lock system of male and female connecting ends. This UL-listed system eliminates the need for cutting, crimping, fitting, or screw-fastening at the connector joints. Just install the appropriate tee or wye and the appliance adapters, and shape the flexible lengths to the space requirements of the job. The AmeriVent gas vent connectors system assures a perfectly accurate, top-performing installation the first time…all at significant savings in time and effort.
Double-Wall Construction
Double-wall metal construction provides protection for health and safety, as well as benefits of economy, ease of installation, efficiency, and protection from property damage. Designers of vent systems should take particular note of the fact that vents constructed of brick, cement, asbestos, and mass-insulated metal require lengthy warm-up periods, whereas double-wall metal vents reach operating temperatures almost instantly for rapid removal of the flue gases.
