Highlights:
- Size: 4"
- Type B gas vent
- OD = ID + 1/2"
- Inner wall aluminum, outerwall galvanized
- 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 or woodburning applications
- External screen prevents entry of most birds
- Boxed