Metal-Fab B-Vent 3
Explore 3 inch Type B gas vent sections and fittings in the Metal-Fab B-Vent product line for your next purchase, replacement, or installation project. Type B vent is a listed gas venting system for appropriate gas-fired appliances; its double-wall construction is different from direct-vent concentric pipe.
For a dependable match, check correct series, 3 inch nominal size, listed appliance application, fitting type, and mounting or termination requirements. The Metal-Fab B-Vent label identifies a particular product family. Nominal size alone does not establish compatibility with other brands or other venting designs.
Understanding 3 inch Metal-Fab B-Vent
For 3 inch Type B gas vent sections and fittings in the Metal-Fab B-Vent product line, correct selection begins with the job the product needs to perform. Type B vent is a listed gas venting system for appropriate gas-fired appliances; its double-wall construction is different from direct-vent concentric pipe.
Appliance and vent system
Type B gas vent, direct-vent assemblies, condensing-appliance polymer vents, and gasketed special gas vent are intended for different applications. This group is organized around 3 inch. Check whether the number refers to a single nominal vent diameter or, in concentric designs, a pair of passages; actual dimensions can vary by series. The Metal-Fab B-Vent family is a useful way to narrow the search, but its joint style and approved accessories still need to match.
Venting layout and safety checks
A complete system may need more than a straight pipe section. Depending on the approved installation, review support hardware, turns, flashing, firestops, adaptors, cleaning access, and the appropriate termination. The permitted route and clearance to combustibles come from the appliance and vent manufacturer, not the category label. Match the appliance instructions, nominal size, connection system, vent route, and termination requirements. If the installation uses a pressure-tight or condensing exhaust system, verify all joint sealing and condensate-handling requirements in its installation guide.
Selection details that matter
- Confirm the appliance manufacturer, model, fuel, and approved vent category or vent family.
- Compare Metal-Fab B-Vent 3 inch Type B joints, diameter, supports, approved gas appliance, and termination.
- Review elbows, tees, supports, wall or roof penetrations, clearances, and termination instructions.
- Check whether any transition or substitute component is explicitly authorized by the manufacturer.
Can Metal-Fab B-Vent 3 inch replace direct-vent gas fireplace pipe?
Not on the basis of diameter. Type B gas vent and direct-vent assemblies are different listed systems with different appliance applications. Use only the vent family named by the appliance installation instructions.
Use the individual listings below for current product details, and confirm the installation manual before final selection. Gas exhaust venting and fuel-supply piping are different product systems.
