Smeg SO610S3PS Manual page 48

Mounting under worktops (mm)
If the appliance is to be built-in under a
worktop, a wooden bar has to be
installed order to use the seal that is
glued to the back of the front panel to
prevent water or other liquids leaking in.
*
Make sure that the piece of furniture
top/rear part has an opening approx.
60 mm deep.
102 - INSTALLATION 91477A665/A