Before installation If the exhaust air is conveyed through the exterior wall, a telescopic wall box should be used. Exhaust air upwards: Pipe diameter: 100 or 120 mm ❑ Break off cover on the top of the extractor hood; strike the retaining points with a tool. To prevent damage to the fan, hold the tool vertically. ❑ Remove the broken off metal part (possibly a noisy and disruptive procedure). ❑ If the pipe diameter is 120 mm, cut out the inner part of the exhaust-air connection. Optimum performance of the extractor hood: ❑ Short, smooth exhaust-air pipe. ❑ Minimum number of pipe bends. ❑ Largest possible pipe diameter (120 mm dia. recommended) and large pipe bends.
If long, rough exhaust-air pipes, many pipe bends or smaller pipe diameters are used, the air extraction rate will no longer be at an optimum level and there will be an increase in noise. ❑ Round pipes: Short discharge pipe: Inner diameter at least 100 mm, extended discharge pipe: Inner diameter at least 120 mm. ❑ Flat ducts must have an inner cross- section equivalent to round pipes with an inner diameter of 100/120 mm. There should be no sharp bends. 100 m dia approx. 1 78 cm 2 125 m dia approx. 113 cm 2 ❑ Insert the exhaust-air connection and turn as far as possible. ❑ If pipe diameters differ: Insert sealing strip. ❑ Ensure an adequate air supply for exhaust-air mode . 24