Miele DA 6690 W Puristic Edition 6000 AM Operating instructions - Page 37

Exhaust duct  Only use smooth pipes or flexible duct hoses made from nonflammable materials for exhaust ductwork.  To achieve the greatest possible air extraction with the lowest noise levels, please note the following: - The diameter of the exhaust duct should not be less than 6" (150 mm). - If flat exhaust ducts are used, the cross section should not be smaller than that of the exhaust connector. - The exhaust duct should be as short and straight as possible. - If elbows are needed, make sure they have a large radius. - The exhaust duct itself must not be kinked or compressed. - Make sure that all connections are secure and airtight.  If the exhaust air is to be conducted into a vent flue, the intake piece must be aligned with the flow direction of the flue.  When installing the exhaust duct horizontally, you must slope it away from the source by at least ³/₈" per 3' 3" (1 cm per meter). This ensures that condensate cannot drain back into the ventilation hood.  If the exhaust duct is to be routed through rooms, ceiling space etc., the temperatures in these different areas may differ greatly, which means that the problem of condensation will need to be addressed. The exhaust duct will need to be insulated. Condensate trap Remember that any constriction of the airflow will reduce extraction performance and increase operating noise.  If the exhaust duct is to be routed through an outside wall, we recommend installing a telescopic wall vent or a rooftop vent (available as an optional accessory). In addition to insulating the exhaust duct, we recommend installing a condensate trap to collect and evaporate any condensate which might accumulate. Condensate traps are available for exhaust ducts with a diameter of 5" (125 mm) or 6" (150 mm). 37