Air Supply - Boulter Camray 5 Installation & Maintenance Manual

Page 17 of 67
The boiler requires a minimum stable draught of 0.1 mbar (0.04w.g.).
If the chimney exceeds 6m (20 feet) in length, it may produce a draught exceeding 0.37 mbar (0.15" w.g.) and
a draught stabiliser should be fitted.
The chimney should comply with the latest edition of the Building Regulations and BS 5410: Part 1.
Factory built chimneys must comply with the Building Regulations and BS 4543 Parts 1 and 3.
Compliance with the Building Regulations does not indicate that the chimney is satisfactory in respect of
draught conditions, or is positioned so that 'down draughts' will not occur.
Special pots and cowls which might restrict the flow of gases must not be fitted and should be removed.
A brick chimney must be fitted with a suitable stainless steel liner. Insulation between the liner and an
exposed chimney may be necessary to avoid condensation.
A flexible liner should be the same diameter as the Flue Offtake size of the boiler - 4"(100mm) or 5" (125mm).
(see page 8)
The Flue pipe, connecting the boiler to the chimney adaptor should be the same diameter as the Boiler Flue
Offtake and should not be more than 1.8m (6'-0") long. Flue Pipes when fitted should satisfy or be 'deemed to
satisfy' the Building Regulations.
Flue pipe bends - 90° bends must not be used -use 135° bends. Bends with soot doors should be used where
necessary
FOR BALANCED FLUE INSTALLATIONS SEE SECTION 6.

4:6 AIR SUPPLY

CONVENTIONAL CHIMNEY INSTALLATION ONLY
A permanent adequate supply of air is required for combustion and correct operation of a draught stabiliser, if
fitted.
file://D:\PL47000\PL47000.htm 14/04/2005