Contura Surround C 11 Installation Instruction page 29

Installation height extension sections C11, C21
In combination with non-flammable wall and chimney connection angled back through the height extension section.
!
Note the different installation methods of the height
extension section. When the protective firewall provided
is not used the air outlet at the rear edge of the top panel
must be plugged.
Apply silicone to the top of the surround and lift up
the concrete sides of the height extension section.
Support the first side so that it does not fall while
the other side is installed.
Install the surround at ordinary height according to
page 47-56. Block the air outlet at the rear edge of
the top panel using the seal plate that is bonded into
position using silicone.
Connect the insert upwards and backwards
within the given heights.
Hang the safety rail between the sides and ensure
that they are straight. Check that the width is the
same as section 1 at the front and rear edges.
GB
ASSEMBLY 65