No person shall install a gas appliance to any flue unless the flue is suitable and in a proper condition for the safe operation of the appliance.
No person shall install a flue pipe so that it enters a brick or masonry chimney in such a way that the seal between the flue pipe and the chimney cannot be inspected.
No person shall connect a gas appliance to a flue which is surrounded by an enclosure unless that enclosure is so sealed that any spillage of products of combustion cannot pass from the enclosure to any room or internal space other than the room or internal space in which the appliance is installed.
No person shall install a power operated flue system for a gas appliance unless it safely prevents the operation of the appliance if the draught fails.
No person shall install a flue other than in a safe position.