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    Type B Vent Pipe Chimney Systems

    B-vent pipe systems for b-vent fireplaces utilizThe air that's inside your home as opposed tThe air from outsideThere are a lot of different parts to this system, like this Dura-Vent Type B Gas Vent Vertical High-Wind Rain Cap that sits oThe top of your chimney. This specific model is designed to be used with a 4-inch chimney. Metal-Fab makes this High-Performance Type B Round Chimney Vent Cap to keep your chimney safe from the outside weather and debris. ????
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    16 Questions & 16 Answers
    from Churchville, MD asked:
    February 16, 2017
    I am looking to order 5" Type B Vent Pipe today; how long will it be before it gets to me?
    1 Answer
    B Vent usually will arrive in 5-10 days and, in some cases, earlier.
    on February 16, 2017

    from Chandler, AZ asked:
    December 17, 2016
    We live in a 25 year old stucco over wood frame home. It has a wood burning fireplace with, what looks like, a type B chimney. In the crawl space while examining the chimney tube I found a loose section. I tried to reinstall and clamp down but found what looks to be a spark arrestor or catalyst unit in the chimney tube about 4' from the top exit. I have been unable to find this and cannot find instructions on how to make this safe/reliable.
    1 Answer
    A wood burning fireplace should not be installed with B-vent pipe as B-venting is not tested to withstand the temperatures produced by wood burning, so this is either a very dangerous installation or the hearth system the B-vent pipe is serving is not actually a wood burning fireplace at all. For clarity, I recommend searching the actual hearth system the flue is serving for a manufacturer name and/or model number. With this information, you may be able to determine what this missing piece actually is. However, if the 4" section was in the crawl space and this truly is a wood burning fireplace, it could be the mesh screening material used on the horizontal cap used with many outside air kits to prevent pests from entering.
    Will M.
    on December 19, 2016

    Mike Earley
    from Soquel, CA asked:
    December 6, 2016
    My propane heating stove requires a B-vent, class A, or masonry - with an approved liner. Is this B-vent acceptabl,e and does it only come in black with Duravent for interior piping?
    1 Answer
    We will be happy to look into this for you. If you could, please provide the manufacturer and model number of your heater.
    Brennan W.
    on December 7, 2016

    from Foster, RI asked:
    March 5, 2016
    Can you use type B-Vent pipe to vent a pellet stove?
    1 Answer
    Unfortunately, no. Pellet rated vent pipe is type L series vent, which uses a stainless steel inner wall. The caustic gases in pellet exhaust will soon corrode the aluminized inner wall of B vent pipe.
    on March 7, 2016

    from Laramie, WY asked:
    October 14, 2015
    I am installing a 7 inch Type B vent pipe system and I have the pipe but I'm not able to find a cap for the 7 inch size. Also, I am going through a cathedral ceiling and I need the device that holds the pipe 1 inch away from combustibles. What would you recommend?
    1 Answer
    The Metal-Fab Type B Round Universal Chimney Vent Cap - For 7 Inch Chimney Systems could be used for the cap, but there is no ceiling support for 7" B-vent. A Firestop will need to be framed in and the Dura-Vent DirectVent Pro Cathedral Ceiling Support Box could be used for decorative purposes.
    Will M.
    on October 14, 2015

    from Paris, TX asked:
    January 20, 2015
    I have a Type B 5" vent pipe that I need to run though a metal shop wall with interior white vinyl insulation. I think I need to purchase something to place on the interior and exterior of the metal shop building walls to hold this vent pipe and to keep it from getting the metal hot around the exit hole. What would you suggest?
    1 Answer
    A B vent wall thimble should be used to trim out the hole you will need to cut and maintain the proper 1 inch clearance required to adjacent materials. An example is the Dura-Vent Type B Gas Vent Wall Thimble - For Vent Pipes with a 5-Inch Diameter - 5GVWT.
    on January 20, 2015

    from Westfield, ID asked:
    October 24, 2014
    I had a certified chimney sweep come to my house and he suggested that I should add a vent so that I could bring outside air into my firebox. I can do the job myself and I just need to know what materials are acceptable. I have a wood burning fireplace that is 52" wide and 29" high. The chimney is high enough and far enough away from other structures. My chimney is a little too small for my opening (Chimney is 13" X 13" terracotta tile). I tried taping aluminum flashing across the top of the opening to make the opening smaller but it didn't help. The certified chimney guy says I need more combustion air and to either leave the door open or add a vent to the fire box. I would like to buy the vent material needed to get more air into my firebox. What would you suggest?
    1 Answer
    When running combustion air for a masonry fireplace, the vent material will be largely custom made. A 22 or 20 gauge sheet metal door, flexible stainless 4 or 5 inch flex line, and outside air termination would be needed. The outside termination can be a standard dryer vent. One product that we do carry is the Condar Air Supply Ventilator. This high quality ventilator can be installed into the wall near the fireplace to provide makeup air from the outdoors. The item features a 10 micron filter and an internal baffle that allows you to close the ventilator when it is not needed.
    on October 24, 2014

    from Rochester Hills, MI asked:
    September 11, 2014
    I have a Mr. Heater 80,000 BTU heater mounted in my garage. I need to run my vent pipe for it. How does the type B pipe connect to my heater?
    1 Answer
    Most all B-Vent appliances have their pipe connect to the appliance by way of a draft hood connector. These connectors are pipe specific and are tapered at the bottom to slide into the flue collar on your appliance.
    Kevin E.
    on September 11, 2014

    from CAN asked:
    September 7, 2014
    Can I put a B vent through a wall? Do you sell black B vent chimneys?
    1 Answer
    Type B gas vent pipe can indeed be vented through a wall using an approved thimble. While the pipe itself is only available in unpainted galvanized steel, it can be easily painted using a high temperature aerosol coating.
    on September 8, 2014

    from Grants Pass, OR asked:
    October 27, 2013
    I have standard 6" black single wall stove pipe on my shop wood stove, rising 20 feet up through the metal roof. It is all open space, with no second story floor in this section. I need a cap to replace the type of rain cap on top. Do I use b-vent or what kind of cap?
    1 Answer
    on October 28, 2013

    from Suffolk County, NY asked:
    September 19, 2013
    Can Type B Vent Pipe can be used for an oil fired boiler? Can you please tell me which type of pipe I have to use for this oil fired boiler? The pipe must be run straight up to the roof inside of the house.
    1 Answer
    Oil fired boilers and stoves create highly corrosive flue gases. As such, type B vent pipe cannot be used. Class A chimney must be used to vent this type of appliance.
    Collin C. - NFI Master Hearth Professional
    on September 20, 2013

    from Ely, MN asked:
    May 29, 2013
    Where can I buy an 8 inches long x 3 1/2 wide oval to round adaptor for a U.S. Stove Company Ranch Stove?
    1 Answer
    For your application, we recommend contacting a local machine shop or sheet metal fabricator to have an oval-to-round adaptor custom-made.
    Tyler M. - NFI Certified Specialist
    on May 29, 2013

    from Indianapolis, IN asked:
    April 22, 2013
    I currently have a 12" diameter Type B Double Wall twist lock flue pipe, surrounded by a fake chimney above the roof. I want to remove the fake chimney, do you know if I need the fake chimney to support my pipe? Will I need a brace? Will my pipe leak into my house?
    1 Answer
    Due to the diameter of your piping, it is likely that the pipe will be self supporting without an issue. It is recommended that a brace be used if the pipe projects 5 feet or more above the roof. The pipe is designed to be air tight and will have at least one inch of overlap at each pipe joint. As such, water should not make its way into the pipe if the sections are attached properly. You should only need to add a roof flashing and storm collar in order to complete the transition to a free standing pipe.
    Collin C. - NFI Master Hearth Professional
    on April 23, 2013

    kenda moody
    from St. Louis, MO asked:
    December 22, 2012
    I have a wood-burning fireplace that has a zone heating kit. It calls for B-vent pipe to run from the fireplace to the heat vent. Is there a substitute for B-vent?
    1 Answer
    It is likely you could use either a rigid or flexible B-vent pipe to accomplish this, but it must be one of the two. B-vent piping has a dual wall setup and would be needed for proper clearances. We carry a large line of B-vent piping manufactured by Simpson Duravent and Metalfab.
    Collin C. - NFI Master Hearth Professional
    on December 23, 2012

    from Cleveland asked:
    November 26, 2012
    My B-vent Pipe has a diameter of 7.56 inches. Which storm collars and caps should I use?
    1 Answer
    I am assuming that this measurement is the outer diameter? If so, this is indeed 7 inch diameter B-vent piping and can use the Metal-Fab Type B Round Chimney Pipe Storm Collar - For Chimney Pipes with a 7 Inch Inner Diameter and the Metal-Fab Type B Round Universal Chimney Vent Cap - For 7 Inch Chimney Systems. Both items are designed with flexibility in mind and can be used with numerous brands of B-vent pipe.
    Collin C. - NFI Master Hearth Professional
    on November 27, 2012

    November 9, 2012
    I needed to break down a 8” vertical B-vent for a gas fireplace, for renovation of the area. I am now trying to re-install it. I am having trouble getting the pipe to go back together. I get the inside pipe to fit but can’t get the outside to slip on. Any tips or tricks?
    1 Answer
    Do you know the brand of pipe with which you are dealing? Does the pipe feature twist-lock connections at the ends? You mention an inner and outer pipe. Are they two separate pipes? If so, what is the dimension of the inner pipe? We look forward to your response.
    on November 9, 2012

    A Type B vent system uses indoor air for combustion, and then the air is vented outside through a chimney that goes up through your home's roof. Installing this type of system for the very first time may be time consuming and difficult; it all depends on the type of chimney system you currently have. If you already have a chimney that goes through the roof, then there's an easy path for the new chimney to follow! Type B vent pipe allows air from outside to come into your home: If there's a downdraft while the fireplace is not being used, cool air from outside can make its way into your living area. However, some fireplaces have glass doors that are specifically designed to keep this cool air inside the fireplace so that it doesn't escape into your home.

    Overall, a type B venting chimney is relatively efficient. Fumes from the fire are vented outside through the chimney, so this type of fireplace is very safe for a home. The parts themselves are inexpensive when compared to other chimney systems, and if you have the right set up, these parts can be very easy to install.
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