Conventional Flue Models; Air Supply - Potterton Kingfisher Mf Installation & Service Instructions Manual

The boiler requires the clearances shown in Fig. 2.
Conventional Flue Models - See Page 7 & 8.
Balanced Flue Models - See Pages 9 & 10.

Conventional Flue Models

1.4

Air Supply

The air requirements must meet BS 5440 Part 2.
The room in which the boiler is installed must be
ventilated. Ventilation of the room containing the boiler
shall include air for combustion and correct operation of
the flue (ie Draught Diverter dilution).
A permanent air vent shall be provided in an outside wall
of the building either at high or low level in accordance
with Table 1.
The opening may be:
a) Directly into the room or space containing the
boiler or indirectly via an opening of at least the
same area.
b) Via a duct either directly into the room or space or
indirectly via an opening of at least the same free
area.
Where air is drawn indirectly from outside through more
than two air vents refer to BS 5440 Part 2.
Where an extraction fan is fitted in the room containing
the boiler, special ventilation requirements must be
implemented. Refer to BS 5440 Part 2.
Any grille and/or duct should be so sited and of a type
not to become easily blocked or flooded and should offer
low resistance to airflow.
If the boiler is installed in a compartment, permanent air
vents are required in the compartment, one at high level
and one at low level (Table 2), either direct to the outside
air or to a room.
Both high level and low level air vents must communicate
with the same room or must be on the same wall to
outside air.
If the boiler is installed in a compartment with a door,
allow at least 25 mm clearance between the front of the
boiler and door for air movement. All other clearances
are as Fig. 2.
Publication No. 5102977
Table 1
Combustion Air
Free Area cm sq.
CFL40 35
CFL50 51
CFL60 68
CFL70 84
CFL80 101
CFL90 117
CFL100 134
Table 2
Compartment Ventilation
Free Area cm sq. High Level
CFL40 132
CFL50 165
CFL60 198
CFL70 231
CFL80 264
CFL90 297
CFL100 331
Installation Requirements
Low Level
264
330
396
462
528
594
662
Fig. 3
7