Collar saddles are provided with a T-piece end leaning at 45° to the main ventilation duct. The piece can be installed on any part of a finished ventilation duct or shaft. The installation requires cutting an opening in the duct, in which the piece is fastened with rivets or screws, and sealing the joint with a silicone or acrylic compound. Collar saddles are available at any T-piece end angle from 30° to 80° for an non-turbulent, smooth air flow.
