9801ST00AMEN
10
4.6
Type
C
Appliances
4.6.1 When using the concentric termination as fig. 7
arrangement, then only an approved system using
Ambi-Rad specified components may be used. These
items are manufactured from seamless aluminium
with connection sockets fitted with silicone double
edged seals, thus assuring, if the components are
undamaged, leak free flue systems.
Important:
This type of flue/combustion air intake
system is regarded as an integral part of the air heater
therefore, departure from the methods of flueing as
published in this document is in breach of the EC Gas
Appliance Directive.
4.6.2 Distances between the appliance and the concentric
flue termination must not be greater than 9.0 m. When
calculating the total length the following equivalent
length data must be taken into
account:
1 elbow @ 45
°
= 1 m
1 elbow @ 90
°
= 1,5 m.
4.7
Type
B
Appliances
4.7.1 If the air heater is to be installed as a B type appliance
as fig. 5 i.e. air for combustion to be taken from within
the space to be heated, then it must be ensured that
an adequate air supply for combustion and ventilation
is provided, in accordance with the regulations and
rules in force.
4.7.2 A horizontal distance between air heater and flue
terminal and any combustion air intake duct, must not
be in excess of 16 m.
Note:
2 Meters of vertical rise negates the
resistance imposed by 1 meter of horizontal run.
Runs exceeding 16m may be subject to condensation
forming within the flue for which provision for its
removal must be made.
Equivalent lengths of flue fittings:
Elbow @ 45
°
= 1 m
Elbow @ 90
°
= 1,5 m.
Flue
terminal
≤
3.0 m
4.7.3 To ensure that the allowable resistance is not
exceeded in the case of horizontal runs of flues, a
positive rise from the air heater of 1
°
i.e. 17 mm per
metre is recommended.
4.7.4 If condensation is to be avoided, flues should not pass
through cold areas or not be installed externally.
4.7.5 When mechanical ventilation is used, it shall be by
mechanical inlet with either mechanical or natural
extraction. Automatic means of control such as
interlocks must be provided. The function of other
ventilation systems in the zone where the air heater is
installed must be taken into account. At no time should
it be possible to create a negative pressure
environment in the zone, this can lead to a hazardous
situation, whereby the air heater flue may act as a
pressure relief.
4.7.6 The terminal of a vertical flue must extend at least 1 m
above a roof surface; flues must not be located where
products of combustion might enter the building.
Terminals suitable for power vented appliances must
be fitted to all flues.
The combustion air inlet if not
used must be protected with an access guard.
Figure 7. Flue systems for appliance types (side flue outlet shown, top outlet available as an alternative)
Installation as type C appliance
Installation as type B appliance
Matching Ambi-Rad flue systems must be used
Air inlet must be fitted with protection guard
