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6. Go outside and cut a hole in the outer wall, repeating the process described above. 7. Cut ducting to the correct length if required. 8. Fit the ducting. Ensure that the duct slopes down away from the fan to allow drainage of any incoming rain water to the outside. 9. Make good the hole around the ducting. Allow the mortar to set before continuing with the fan installation. If installing in a window or panel 1. Cut a hole, 125mm in diameter or if installing in a window, obtain a ready cut pan