Baxi Bermuda 45/4 M Installation And Servicing Instructions page 10

SITE REQUIREMENTS - Page 10
FLUE
Prior to installation it is important to establish that the
flue will perform satisfactorily. Do not proceed with the
installation if the flue does not operate correctly.
The Bermuda is fitted with an Atmospheric sensing
Device that will automatically shut the appliance down
under adverse flue conditions and where insufficient
flue pull exists.
The flue installation must conform to BS 5440 Pt 1. The flue
must have a minimum vertical height of 3m (10ft) measured
from the boiler flue outlet socket and have an internal cross
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section area of 12,700 mm (20in ), this is satisfied by a flue
of 125mm (5in) internal diameter. If the flue system contains
any bends the vertical height must be increased accordingly.
An approved terminal is required for all installations.
9in X 9in BRICK
Flues previously used for other fuels must be thoroughly
swept. The flue must be protected with a 125mm (5in)
flexible liner. The bottom of the liner should terminate
500mm (20in) above the base of the builders opening. The
flue must be sealed between the liner and the brickwork at
both the top and bottom.
An approved terminal must be installed.
ACID RESISTANT LINERS
A flue constructed of acid resistant liners is satisfactory
provided the size requirements are met.
The boiler flue outlet can be connected to the flue by
means of a short length of 125mm (5in) of flue pipe.
A seal must be made in the annular space between the outer
face of this flue pipe and the acid resistant liner.
An approved terminal must be installed.
PRECAST FLUES
These must conform to BS 5440 Pt 1 and be correctly
designed and installed without intrusion of cement into the
flue passage.
An approved terminal must be installed.
PROPRIETARY FLUES
A flue of this type must meet the size requirements specified
and be installed in accordance with the flue manufacturers
recommendation and relevant codes of practice.
An approved terminal must be installed.