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We strongly recommend that the hood is only used as a filtering version if it is impossible to duct
out.
Ducting Information
To obtain the best possible extraction performance use 150mm diameter ducting. Wherever
possible utilise rigid circular pipe or “Mega duct” ducting. Both types are available via your
Britannia dealer. Do not use expanding concertina type ducting as this is not smooth on the
interior and can cause air flow restrictions. Do not use ducting that has a smaller diameter than
150mm as this will reduce extraction rates and can increase noise levels. Please note ducting kits
and ducting components are optional accessories and have to be ordered. They are not supplied
with the hood.
Maximum length of ducting run
4 metres with 1 x 90 degree bend
3 metres with 2 x 90 degree bends
2 metres with 3 x 90 degree bends
Note: the shorter the ducting run and the least number of bends gives the best extraction
performance.
Warning: Any ducting used must be fire retardant.