Double-Wall Type B Gas Vent
Description
Double wall HVAC pipe is a type of heating, ventilation, and air conditioning (HVAC) ductwork that consists of two concentric layers of metal or plastic piping. The inner layer is used to transport heated or cooled air, while the outer layer provides insulation and protects the inner layer from external factors such as moisture, temperature changes, and mechanical damage.
Frequently Asked Questions
What carries flue gas from a water heater or furnace through the roof?
Double-wall Type B gas vent carries flue gases from approved gas-fired appliances through a listed venting system.
What does the double-wall construction do in a Type B Gas Vent?
The inner wall carries flue gases while the outer wall provides the separation required by the listed Type B vent system.
Which end configurations are required for Double-Wall Type B Gas Vent?
Type B vent sections join with the listed fittings made for that system. Ordinary crimped HVAC duct ends are not an acceptable substitute.
Which material details are needed for Double-Wall Type B Gas Vent?
Use listed Type B vent components approved for the connected gas-fired appliance; material, joints, supports, and clearances are part of the vent system.