Miele DA 399-6 Service Manual download pdf (Page 29)

Connection for air extraction

29

 Before installation, it is important

to read the information given on the

following pages as well as the

"Appliance dimensions" and the

"Warning and Safety instructions" at

the beginning of this booklet. This is

particularly crucial when using the

cooker hood at the same time as a

heating appliance that relies on

oxygen from the same room, which

could result in the build-up of toxic

fumes.

It is essential that the "Warning and

Safety" instructions are observed.

The cooker hood should be installed

according to local and national

building regulations. Seek approval

from the building inspector where

necessary.

 Use smooth or flexible ducting made

from approved non-flammable

materials for exhaust ducting.

 When using an external motor, make

sure that the exhaust ducting is

sufficiently rigid. The external motor

can cause an underpressure which

can result in the exhaust ducting

distorting.

 To achieve the most efficient air

extraction with the lowest noise

levels, please note the following:

– To ensure efficient air extraction, the

diameter of the exhaust ducting

should not be less than 150 mm.

– If flat ducting is being used, the cross

section must not be smaller than the

cross sectional area of the exhaust

connection.

– The exhaust ducting should be as

short and straight as possible.

– Only use wide radius bends.

– The exhaust duct must not be kinked

or compressed.

– Ensure that all connections are

strong and airtight.

Remember that any constriction of

the air flow will reduce extraction

performance and increase operating

noise.

 If the exhaust is ducted through an

outside wall, a telescopic wall vent or

a roof vent (available as an optional

accessory) is recommended.

 If the exhaust air is to be ducted into

a vent flue, the ducting must be

directed in the flow direction of the

flue.

 When ducting is horizontal it must be

laid to slope away at at least 1 cm

per metre. This is to ensure that

condensate cannot drain back into

the appliance.

 If the exhaust ducting is to run

through rooms, ceiling space etc.

where there may be great variations

in temperature between the different

areas, the problem of condensation

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