Smeg SH670LSS1 User Manual page 17

 It is recommended to use semi-rigid aluminum ducting.
The maximum distance between the coupling and your discharge outlet should be 3

meters, with one 90 degree bend. For each additional 90 degree bend, the maximum
distance is reduced by a further meter, or the rangehood's ability to extract efficiently will
be reduced.

.
 Before fixing the rangehood into the kitchen unit, you should connect the other end of
the ducting hose to the coupling in the top of the rangehood.
Completing the installation

If you are setting the appliance to recirculation mode, then you should now fit the two
charcoal filters. See the "Fitting the charcoal filters" section on page
 The electrical connection must correspond to the electrical requirement noted on the
rating plate, which is placed inside the rangehood. The appliance should now be
connected to the electrical supply. See page 10 for detailed information on the
electrical connection.
Refit the grease filter and then switch on the mains supply to the appliance.
Check that the appliance is operating correctly by selecting each speed and
switching the lights on and off.
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