Contura Surround C 11 Installation Instruction page 31

Cut the insulation sheets and seal above the seal
plates.
Concrete variant
Apply silicone along the front edge of the sides and bond the
front in position. Position the soot hatch loosely without silicone
to make it possible to sweep through the front.
Place the top plate in position between the concrete
sides. For the top panel to fit the Contura 21 the
breakouts in the side must be removed.
To avoid gaps in the panel lines of the front area, the height
extension panel must be hung first without silicone. Adjust
the components so that the joints between them look good,
use shims where necessary.
GB
ASSEMBLY 67