14
Ducting
The ducting used should be 150mm, rigid circular pipe and must be
manufactured from fire retardant material, produced to BS 476 or DIN
4102-B1.
Wherever possible utilise rigid circular pipe which has a smooth
interior, rather than the expanding concertina type ducting. The
lengths of ducting with minimal effect on performance are as follows:
•
4 metres with 1 x 90° bend.
•
3 metres with 2 x 90° bends.
•
2 metres with 3 x 90° bends.
Longer ducting can be used but the performance of the extractor will
likely be reduced.
Please note
: Ducting components and ducting kits are optional
accessories and have to be ordered, they are not automatically
supplied with the hood. Use of ducting less than 150mm in diameter
will affect performance and increase the noise produced by the
extractor.
Note that the ducting should be secured and sealed to the vent outlet
pipe / valve using appropriate jubilee clips or securing means.
