Type B vents consist of which type of pipe?

Type B vents are specifically designed for use with gas-fired appliances and consist of double-walled construction. This design features an inner pipe that carries the combustion gases and an outer pipe that provides necessary insulation. The double-wall aspect allows for effective heat dissipation and enhances safety by minimizing the risk of ignition of surrounding materials.

The design also facilitates the installation process as it allows for a reduced clearance to combustible materials compared to single-walled vents. The insulation between the inner and outer walls improves the vent's efficiency, as it helps maintain the temperature of the exhaust gases, which is essential for proper venting and preventing condensation within the pipe.

In summary, Type B vents are recognized for their double-walled construction, which optimizes safety and performance for gas venting applications.