A Round Takeoff from Flat Duct, these #860s have a 1-1/2″ flange and are used when spiral comes off rectangular duct. Frequently used in high/medium pressure applications upstream of VAV boxes.
Because of their longer round length these are also used when a damper is required or when Galvanneal is specified since Airtites and Bellmouth Fittings are only readily available in Galvanized.
