7.3.4 Connection to an existing chimneyThe appliance can be connected to an existing chimney (C91). A 100 mm diameter flexible SS pipe is placed in the chimney for discharging flue gases. The surrounding space is used as combustion air supply. Use the DRU spacer here. Place this spacer every three metres.For a ø200/130 mm appliance connection, the concentric system must be updated to a diameter of 150/100 mm, following which it can be connected to an existing chimney flue (see section 7.3.2).The following requirements apply when connecting to an existing chimney:-Only allowed when used in combination with the special DRU chimney kit.-The internal dimensions should be at least 150 x 150 mm.-The vertical length has a maximum of 12 metres.-The total horizontal pipe length may have a maximum length (see table 7-3).-The existing chimney has to be clean.-The existing chimney has to be tight.For adjusting the appliance, the same conditions/instructions apply as for the concentric system described above.7.4 Placing the chimney breastFor a good heat discharge and operation of the appliance, there should be sufficient space around the appliance. The chimney breast should be ventilated sufficiently by means of ventilation holes (incoming and outgoing).3-When an appliance is built in the floor, please take into account the minimum distances from the floor/ground in front of the appliance (see fig. 7-12).-Use non combustible and heat-resistant material for the chimney breast, including the top of the chimney breast, the material inside the chimney breast and the back wall of the chimney breast.The appliance is not a support structure. Make sure the appliance does not have to bear the weight of the chimney breast for example.-The passage of the ventilation holes (outgoing) is stated in table 4-1. If it is not possible to use a control hatch in the chimney breast, an air supply of at least 80 cm2 must be placed as low as possible, but not above the burner surface. If a control hatch can be used, the control hatch will suffice as air supply (see section 7.5).Installation manual23
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