Remove the lifting gear.
Screw in the speed sensor (86505) along with the O-ring (86506) and
plug in the cable connector (86515).
Fit the O-ring (77005) to the wall insert (77000).
Fit the lifting gear and the swivel lifting eye (90235).
Align and fit the wall insert (77000) using the centring screw (90187).
Place the diffuser (79000) in position using the swivel lifting eye
(90235).
Remove the swivel lifting eye (90235).
Fit the screws (72002).
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