Round, double-wall gas vent pipe for venting natural gas and propane Category I appliances such as gas furnaces, water heaters, and boilers. Aluminum inner wall resists corrosion from flue gases; galvanized steel outer wall protects against weather and impact. Twist-lock joint snaps together for quick, tool-free assembly.

• Size: 3" diameter x 12" length
• Double-wall construction: aluminum inner wall, galvanized steel outer wall
• Twist-lock joint snaps together without tools, screws, or sealant
• 1" clearance to combustibles
• 1-1/2" sectional overlap per joint - net assembled length is 1-1/2" less than listed length
• Listed to UL 441 for use with Category I gas appliances only
• Combine multiple sections to reach the required vent height

Tip: Type B Gas Vent is for natural gas and propane appliances only. Do not use with wood, coal, pellet, or oil-burning appliances. Plan the run so that each joint sits with the female end down (collar facing up) and twist-lock until you hear the snap.