Contura Surround C 11 Installation Instruction page 10

GB
46 CHIMNEY
Raised surround
Non-flammable wall / Firewall
When the height extension section is installed in the integrated protective screen, the air outlet at the top of the surround nearest to the wall must
be sealed and the whole top surface insulated. It is also possible to connect the chimney with a backward angle through the height extension section
that requires a seal above the angle.
Protective screen
When the height extension section is installed the protective screen must be extended with a heat deflector through the height extension
section. Ensure that the heat deflector is also ventilated. The top of the surround is also insulated using the insulation sheet provided.