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  1. Class B chimneys, also known as Type B-vents, are double-walled metal chimneys/flues used for venting gas-fired appliances1234. They have their own set of combustible clearance and installation specifications1. B-vents are designed for negative pressure applications and flue gas temperatures not exceeding 400°F above ambient for Category I appliances2. They are not permitted for use with incinerators and are intended for use only with LP or natural gas appliances4.
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    Type B-vents are double-walled metal chimneys/flues and can be used only with listed, draft-hood equipped gas appliances. Type B gas vents such as the Ameri-Vent™ are permitted for venting gas-fired appliances and have their own set of combustible clearance and installation specifications.

    B-Vents, Gas Chimneys: Suggestions for t…

    inspectapedia.com/chimneys/B-Vent-Chimneys.php
    Type B Gas Vent is designed for negative pressure applications and flue gas temperatures not exceeding 400°F above ambient for Category I appliances. Durability is the result of high-quality materials and workmanship, with galvanized outer pipe and aluminum inner pipe providing protection against corrosion and external damage.

    Type B Vent (Gas) - Hart & Cooley

    www.hartandcooley.com/chimney-and-vent/type-b …
    B-Vent Chimneys are metal pipes used strictly for gas appliances. Often still used by contractors but is becoming less common. We’ve seen these pipes called many things online. Often b-vents are referred to as “Class B” or “B-Class”, “natural vent” or a “Type-B”.

    Types of Chimneys - Compare Masonry, …

    fullservicechimney.com/chimney-types/
    Type B-vents are double-walled metal chimneys/flues and can be used only with listed, draft-hood equipped gas appliances. A Type B vent is intended for relatively low-heat applications. B-vents are not permitted for use with incinerators and are not intended for use with appliances burning anything other than LP or natural gas.

    Type B-Vent Chimney Ceiling Floor & Wa…

    inspectapedia.com/chimneys/B-Vent-Chimney-Cle…
  2. People also ask
    What is a Class A chimney pipe?
    There are two types of Class A chimney pipe: Solid-packed chimney — These pipes have smaller inner diameters (usually ranging from 5 inches to 8 inches) and some insulation, either double-wall (like Simpson DuraVent DuraTech pipe) or triple-wall (like Simpson DuraVent DuraPlus pipe).

    The Ultimate Guide To 5 Types of Chimney Pipe: By The Pros

    efireplacestore.com
    What is a B-vent chimney?
    The B-vent's exterior surface is designed to not exceed 90°F - thus meeting fire clearance and safety code requirements, but it does so with an air space between an inner and outer metal flue. Contrast that with other more-insulated chimneys such as Class-A Chimneys whose construction involves an insulator see CLASS A CHIMNEYS, MetalBestos™

    B-Vents, Gas Chimneys: Suggestions for the selection, installation

    inspectapedia.com
    What is a Class A chimney tee?
    Tees are most commonly used as connectors between stove pipe and Class A chimney systems, as the pipe that exits the home needs to be turned 90 degrees to run vertically up to the roof for termination. All Class A chimney tees will need tee support as the base support point for the vertical pipe.

    The Ultimate Guide To 5 Types of Chimney Pipe: By The Pros

    efireplacestore.com
    What is a prefabricated chimney?
    A factory-built or prefabricated type is a metal chimney and this type is typically made of stainless steel and can be double or triple walled. Older air-cooled chimneys used three walls and a thermosyphon design to bring outside air in and back out again to keep the chimney from getting too hot and catching the chimney chase on fire.

    Chimney Types: Compare Masonry, Prefab, & Stoves - Full Service Chim…

    fullservicechimney.com
    Does a prefab fireplace have a chimney?
    A prefab fireplace must have a prefab chimney. All parts of a prefabricated system are manufactured in a factory and later assembled at the job site. The prefabricated chimney type is a metal flue pipe system designed to vent smoke out of the house.

    Chimney Types: Compare Masonry, Prefab, & Stoves - Full Service Chim…

    fullservicechimney.com
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  3. Hart & Cooley
    https://www.hartandcooley.com/chimney-and-vent/type-b-vent-gas

    Type B Vent (Gas) - Hart & Cooley

  4. InspectAPedia
    https://inspectapedia.com/chimneys/B-Vent-Chimneys.php

    B-Vents, Gas Chimneys: Suggestions for the selection, installation ...

  5. Images of Class B Chimney

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  6. InspectAPedia
    https://inspectapedia.com/chimneys/B-Vent-Chimney...

    Type B-Vent Chimney Ceiling Floor & Wall Clearance Distances

  7. Full Service Chimney
    https://fullservicechimney.com/chimney-types

    Chimney Types: Compare Masonry, Prefab, & Stoves - Full Service …

  8. Hart & Cooley
    https://www.hartandcooley.com/files/assets/files/...
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    Sizing Guide Type B Gas Vent All Fuel Chimney - Hart & Cooley

  9. Hart & Cooley
    https://www.hartandcooley.com/articles/how-do-i...

    How do I know what size B-vent to use? - Hart & Cooley

  10. AmeriVent
    https://www.ameri-vent.com/product/typ…

    Type B Gas Vent - Amerivent

    Featuring Snap-Lock joints that are quick and easy to disconnect, the Amerivent Type B gas vent system is lightweight with no sacrifice in strength, and is available in large sizes, adjustable components, and multi-story Type BW …

  11. Northline Express
    https://www.northlineexpress.com/all-ab…

    All About Type-B Gas Vent Fireplaces - Northline Express

    Jun 18, 2020 · Type-B Gas Vent is a chimney venting system that is specifically designed to make use of air within the room to aid combustion. Type-B DuraConnect Gas Vent Pipe is a low-cost, space saving chimney venting …