Etherma ET-71 Manuel page 26

Surface mounting
If recessed mounting is not possible,
use the extension frame for surface
mounting. This is not included and
must be ordered separately
Attach the extension frame to the wall
with screws. Then mount the thermostat
as indicated in the normal instructions.
Fitting with back plate
If the existing frame will not cover the
hole, use a Back Plate. This is not in-
cluded and must be ordered separately
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