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Dura-Vent Type B Type B Vent Pipe

Applications - DuraVent Dura-Vent's Type B Gas Vent system is for use with natural gas or liquid propane category I and draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent for a wide range of applications, including: natural gas fireplaces, gasfired furnaces, boilers, water heaters, and wall or space heating applications.

Materials and Construction - Round Type B Gas Vent 3" - 8" and oval 4" - 6": Aluminum .012" inner wall, galvanized .018" outer wall. Round Type B Gas Vent 10" - 16": Aluminum .016" inner wall, galvanized .021" outer wall. Round Type B Gas Vent 18" - 30": aluminum .020" inner wall, galvanized .021" outer wall. 3"-16" diameters feature twist-lock fittings, screws required for 18" and larger diameters.

Clearances - 1" clearance to combustibles in single and multi-family dwellings.

Listings - UL Listed to UL 441 and UL 1777 (MH6357). ULC Listed to ULC S605 (CMH1276 & CMH1407).

By Jim Gentry from Galveston, Texas on December 26, 2012
Why do I have to change the roof jack bonnet when I install a new draft-induced 80% natural gas furnace?
By Customer Service on December 26, 2012

Every chimney system must use an appropriately-sized roof flashing/roof jack that is made for the particular type and size of pipe for proper UL listing.

By Alex from OH on July 4, 2013
Can B Vent go through a plastic garden shed wall?
By Tyler on July 5, 2013

Yes, as long as the required 1" clearance is maintained, type B gas vent pipe may be used.

By Mark from Rochester, MN on May 3, 2016
I have a small wood stove on a porch. Can I use Type B vent pipe to replace the 30 year old stuff that I have been using?
By Collin - Elite Deals Product Specialist on May 3, 2016

Type B vent pipe is actually manufactured for gas applications only, as the inner liner is aluminum and can easily deform in a wood burning application. Only galvanized steel single wall stovepipe or stainless steel double walled stovepipe should be used.

By Kevin Bebout from Western KY on January 4, 2013
Below are the specifications for a tankless hot water heater. I am installing two of these inside the mechanical room of a residence. I need the best way to vent these appliances, either separately or together. It would be best to bring the vents together in the attic space and only have a single hole in the roof.

Natural Gas Model Number: PH-24M-DN
LP Gas Model Number: PH-24M-DP

Rated Gas Input (BTUs/Hr.): Full 178,500, Minimum 37,700
Dimensions (inches): 40-3/4 x 18-3/4 x 14-7/8
Empty Net Weight: 76 lbs.
Minimum Working Water Pressure: Minimum 2.4 P.S.I.; Full 12.9 P.S.I.
Flue Size
7-inch Diameter
Vent Type
Atmospherically Vented using "B" vent
Gas Connection
3/4" NPT Female
Water Connection
3/4" NPT Male

Hot water output degree rise (U.S. gal/min)
60-degree F Rise
0.87~ 3.17
70-degree F Rise
0.75 ~ 1.17
80-degree F Rise
0.65 ~ 3.17
90-degree F Rise
0.58 ~ 3.17
100-degree F Rise
0.52 ~ 2.85

By Tyler on January 4, 2013

You need 7" inner diameter B-vent pipe for your heaters, and we do carry Metal-Fab's 7" B-vent pipe:
Metal-Fab Type B Round Chimney Pipe Length - 7" x 48"

You would need to use elbows and tees to connect the venting for both heaters and then run the pipe out through the roof. To see all of our 7" diameter Type B vent pipe, please see this page: Type B Vent Pipe