Metal-Fab B-Vent Firestop - 8MFS

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Metal-Fab B-Vent Firestop - 8MFS

Metal-Fab's round and oval Type-B vent is listed by Underwriters Laboratories for use with approved category 1 gas furnaces, heaters, and boilers. A category 1 appliance operates with a non-positive vent static pressure. The double wall design of B-vent enables the product to be used in homes and commercial buildings at close clearance to combustible. Metal-Fab's B-vent design incorporates features that make installation quick, easy, and safe. Some of those features are:

* Elimination of sharp edges by hemming the flue and casing.
* Assembly and disassembly, without tools, using positive twist lock.
* 360 degree rotation of small diameter fittings using swivel tees, wyes, and elbows.
* Space savings inside standard stud walls using oval pipe.

UL listed to mate with other specifically identified and listed round gas vent, 3"-6" diameters, allowing you to add a new run of Metal-Fab B-vent to an existing run of common vent. B Vent Metal-Fab 3"-6" diameter B-vent pipe is standard with the Surelock B-Vent Locking System . The patented locking system provides a secure lock with just the push of a tab, and can be easily disassembled by pulling the tab back out.

We strive to ship within 5-7 business days, but in-season delivery can take up to 2 weeks or more. If you have any questions or concerns about delivery, please e-mail us at:

Click to see the Metal-Fab B-Vent Brochure

Click to see the Metal-Fab B-Vent Installation for 3-14 Diameter Products

Click to see the Metal-Fab B-Vent Installation for 16-30 Diameter Products

Click to see the Metal-Fab B-Vent Installation for Single Wall Flex Connector Products

Click to see the Metal-Fab B-Vent Installation for Double Wall Flex Connector Products

Click to see the Metal Fab B-Vent Sizing Tables

Click to see the Metal-Fab B-Vent Specifications

Click to see the Metal-Fab B-Vent UL Listed Connections

Click to see the Metal-Fab B-Flex Brochure

Manufacturer Warranty*
The Metal-Fab Type-B Gas Vent when installed according to manufacturers installation instructions, as prescribed by Underwriter Laboratories Standard 441 and 103, is warranted by Metal-Fab Inc. for one (1) year from the date of its original installation against defects in material or workmanship of the product for parts only.*
*For complete warranty details, please see the Metal-Fab Certificate of Warranty (PDF).

California residents please click on the link for information on Proposition 65 BEFORE purchasing.
Supply chain disruptions have greatly impacted inventory levels in our industry, as well as in many other organizations across the globe. We want to personally acknowledge these shifts in supply levels have affected our ability to surpass your expectations in many situations for prompt delivery of your order. Should you not be able to wait for supply delays, please contact us about stock levels before ordering. As always, we thank you for your business!