Miele KM 6395 Operating And Installation Instructions page 35

Safety distance when installing the appliance near a wall with additional
niche cladding
A minimum safety distance must be maintained between the edge of the cooktop
and any niche cladding to protect it from heat damage.
If the niche cladding is made from a combustible material (e. g. wood) a
minimum safety distance e of 50 mm must be maintained between the cooktop
and the cladding.
If the niche cladding is made from a non-combustible material (e. g. metal,
natural stone, ceramic tiles) a minimum safety distance e of 50 mm less the
thickness of the cladding must be maintained between the cooktop and the
cladding.
Example: 15 mm niche cladding
50 mm - 15 mm = minimum safety distance of 35 mm
Flush-fitted cooktops
a Masonry
b Niche cladding
Dimension x = thickness of niche cladding material
c Worktop
d Worktop cut-out
e Minimum safety distance
for combustible materials is 50 mm
for non-combustible materials is 50 mm less dimension x
Safety distances
Cooktop with frame or bevelled edge
35