Bosch DHU 625M Operating And Installation Instructions page 20

❑ Snap the one-way flap into the air pipe.
❑ For optimum extractor hood efficiency:
❑ Short, smooth air exhaust pipe.
❑ As few bends in the pipe as possible.
❑ Diameter of pipe to be as large as
possible and no tight bends in pipe.
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:
We recommend Internal diameter:
120 mm
❑ Flat ducts must have an internal cross
section that equates to that of round
pipes.
There should be no sharp bends.
Ø 150 mm approx. 177 cm
❑ If pipes have different diameters:
Insert sealing strip.
❑ For exhaust-air mode,
is an adequate supply of fresh air.
Connecting a Ø 150 mm exhaust-air pipe:
❑ Mount the pipe directly onto the air outlet
on the hood.
Circulating-air mode
❑ With activated carbon filter if exhaust-air
mode is not possible.
2 .
ensure that there