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Type B Vent Pipe

Type-B vent pipe is an option for venting a fireplace that makes use of air within the room to aid combustion. Type-B vent pipe is a little less efficient that direct venting, but it saves space, is relatively easy to install, and costs less than some other types of vent pipe. If this sounds like it fits your needs, browse our large array of high-quality, low-priced Type-B vent pipe and get your project started today.
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By kenda moody from St. Louis, MO on 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?
By Collin C. - NFI Master Hearth Professional on December 23, 2012

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.

By Bob from Rochester Hills, MI on 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?

By Kevin E. on September 11, 2014

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.

By John from Cleveland on November 26, 2012
My B-vent Pipe has a diameter of 7.56 inches. Which storm collars and caps should I use?
By Collin C. - NFI Master Hearth Professional on November 27, 2012

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.

By Dale from Grants Pass, OR on 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?
By Chris on October 28, 2013

I would recommend the HomeSaver Pro 6 Inch Round Chimney Cap.

By Kevin from Indianapolis, IN on 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?
By Collin C. - NFI Master Hearth Professional on April 23, 2013

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.

By Jim from Laramie, WY on 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?
By Will M. on October 14, 2015

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.

By Karen from Ely, MN on 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?
By Tyler M. - NFI Certified Specialist on May 29, 2013

For your application, we recommend contacting a local machine shop or sheet metal fabricator to have an oval-to-round adaptor custom-made.

By Tim from Paris, TX on 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?
By eFireplaceStore on January 20, 2015

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.

By Roger from Foster, RI on March 5, 2016
Can you use type B-Vent pipe to vent a pellet stove?
By eFireplaceStore on March 7, 2016

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.

By Ken from CAN on September 7, 2014
Can I put a B vent through a wall? Do you sell black B vent chimneys?
By eFireplaceStore on September 8, 2014

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.

By Paul from Westfield, ID on 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?

By eFireplaceStore on October 24, 2014

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.

By Ray on November 9, 2012
I needed to break down a 8Ē 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 canít get the outside to slip on. Any tips or tricks?
on November 9, 2012

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.

By Kozmev from Suffolk County, NY on 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.
By Collin C. - NFI Master Hearth Professional on September 20, 2013

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.

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