The ASCA Steel Chimney Adapter is used to provide support for the installation of an RS or RSHT chimney fan on a round, air-cooled steel chimney. It is mounted at the chimney termination point.
The adapter consists of a square mounting plate to support the fan, and a round collar that can slide into the chimney for a tight fit. The outer diameter of the collar is 1/8" smaller than the inner diameter of the chimney. The 5" collar eliminates the need to secure the adapter externally.