Miele CS 1421 Operating And Installation Instructions page 9

Warning and Safety instructions
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If the salamander is installed behind a furniture panel (e.g. a door),
ensure that the door is never closed whilst the salamander is in use.
Heat and moisture can build up behind a closed furniture panel and
cause subsequent damage to the salamander, the housing unit and
the floor. Do not close the door until the residual heat indicators have
gone out.
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