Baxi Bermuda 45/4 M Installation And Servicing Instructions page 22

INSTALLATION - Page 22
Flue Connection
If not already fitted, secure the boiler hood to the combustion
box using the 4 hexagon set screws and nuts from the kit.
Locate the flue within the flue socket and secure with
the three self tapping screws provided in the kit.
Seal the flue into the flue outlet socket.
Completion
Seal off any secondary openings within the builders opening
after wrapping the gas and water pipes where they pass
through the brickwork and within the opening itself. (B.S.
5871 Part 1).
If required (see page 12) secure the cable to the boiler using
the 'P clip and screw to either boiler base (see page 20) or
fire support plate.
The fire support plate is supplied in the fire front carton.