Selkirk 184082 Adjustable Round Gas Vent Pipe, 4 x 12

Highlights:

• Size: 4 x 12
• Type B gas vent
• OD = ID + 1/2
• Max installed length 10-1/2. min. 3-1/2
• Aluminum inner wall. galvanized outer wall
• For gravity draft venting of LP or natural gas appliances
• 100 million BTU/hr. max.. 500 degree max.
• Not for wall furnaces