Bosch DHU635GLV, Operating And Installation Instructions

10 

Prior to installation

Exhaust-air mode 

The exhaust air is discharged upwards 
through a ventilation shaft or directly through 
the outside wall into the open. 

For operating in exhaust-air mode, 

a one- 

way flap should be mounted inside the wall 
ventilation box. 

If no one-way flap was enclosed with the 
hood, it can be obtained from a specialist 
retailer. 

Installing the one-way flap: 

Snap the one-way flap into the air pipe. 

The two lightly sprung flaps must be able to 
move upwards. 

If the exhaust air is going to be 
discharged into the open,

 a telescopic wall 

box should be fitted into the outside wall. 

❑

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:

Short discharge pipe:

Inner diameter 

at least 100 mm,

extended discharge pipe

:

Inner diameter 

at least 125 mm.

❑

Flat ducts 

must have an

 inner

crosssection equivalent 

to round pipes

with an inner diameter of 100/125 mm.

There should be no sharp bends.

100 mm dia approx. 113 cm2
125 mm dia approx. 178 cm2

❑

If pipe diameters differ:

Insert sealing strip.

❑

Ensure an adequate air supply 

for

exhaust-air mode.

Exhaust air upwards: 

Pipe diameter: 125/100 mm 

❑

Insert the exhaust-air connection and
turn as far as possible.

To the outside 

Coupling ring Ø125 
or Ø 100 (Bayonet 
and screw fitting) 

Pipe