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Check there are no buried pipes or cables in the ventilation shaft. If in doubt, seek professional advise. 2. Cut a hole 110mm in diameter, in the side of the shaft. airflow across the room (e.g. opposite the internal doorway). • Near the source of steam or odours. • Not where ambient temperatures are likely to exceed 50.C. • If installed in a kitchen fans must not be mounted immediately above a cooker hob, or eye level grill. • If installing in a room containing a fuel burning device which has