Spigot Flanged Base Plate
Spigot Flanges are designed to be mounted to a flat surface such as a wall, window or even a door and allow for you to slot your ducting over the flange.
The spigot flange is a whole with a flange on it, which you can mount to the wall and attached ducting too.
Clamps will be recommended to attached and fasten ducting to the spigot flange.
These are manufactured from galvanized metal mild steel.