Round gas vent double wall construction with it's built-in air space, provides permanent insulation and keeps the inner pipe hot and outer relatively cool.
- Size: 4"
- Type B gas vent
- OD = ID + 1/2"
- Inner wall aluminum alloy, outer wall galvanized
- Closes off bottom of tee
- For gravity draft venting of "listed" LP or natural gas burning appliances
- 100 million BTU per hr., 500 degree F max.
- Not for wall furnaces