16
Fig. 14 Fig. 15
Figu re 9 - Mo unt the chimne y
Figu re 10 - Adj ust an d s ecure the chim ney
Mount the chimney Adjust and secure the chimney
Ducting and ventilation
For best performance and lowest noise output, we recommend the
use of 150mm ducting. 125mm (or even 100mm) ducting may be
used but this will reduce performance and increase the noise of the
extractor.
Wherever possible utilise rigid circular pipe which has a smooth
interior, rather than the expanding concertina type ducting. The
lengths of ducting with minimal eect 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.
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