INSTALLATION
SECTION 3
Detailed recommendations for air supply are given in BS 5440 part 2.
The following notes are intended to give general guidance:
Where the heater is to be installed in a room or internal space the heater requires the
room or internal space containing it to have a permanent air vent. The vent must be
either direct to outside air or to an adjacent room or internal space which must itself have
a permanent vent of at least the same size direct to outside air. The minimum effective
area of the permanent air vent(s) required is as follows:
5 cm
2
per kW in excess of 7 kW
Where the heater is to be installed in a compartment, permanent air vents are required in
the compartment at high and low level. These air vents must either communicate with a
room or internal space or be direct to outside air.
The minimum effective areas of the permanent air vents required in the compartment are
as follows:-
7
AIR SUPPLY
FLUE SYSTEM
Air Vent Areas
Position of
Air from room or
Air direct from
Air Vents
internal space
outside
High Level
10 cm
2
per kW
5cm
2
per kW
Low level
20cm
2
per kW
10cm
2
per kW
(a Max)
(b Max)
0.3m
Fig 2.
Typical Flue
Installation
Size
RFF190
RFF280
a
8m
5m
b
7m
4m
