1103UDSA-2--EN, Pag. 9/36
Flues for power
vented installations
(type B appliances)
Figure 2 : Approved appliances type B
B22 - roof
Flue outlet
Venter outlet attachment requirements:
Depending on the size of fl ue pipe as determined in table 5, attach either the fl ue
pipe directly to the collar or a taper-type connector.
WARNING :
B22 - wall
If the air heater is to be installed as a type B appliance, air for combustion will be
taken from within the space where the heater is installed. Ensure that an adequate
air supply for combustion and ventilation is provided within the building in ac-
cordance with BS6230/BS5440 plus other relevant regulations & rules in force.
Gasket sealed single wall fl ue seamless aluminium or stainless steel pipes are
required. All joints must be sealed to prevent products of combustion from leaking
into the building. If the fl ue passes through a combustible element of the building
it must be enclosed by a sleeve of non-combustible material and separated from
the sleeve by a minimum of 25 mm air break. The temperature of any combustible
material near to the fl ue must not exceed 65°C when the heater is in operation. The
fl ue must be at least 150 mm away from any combustible material.
Single wall fl ue pipe exposed to cold air or run through unheated areas should
be insulated to avoid condensation. Provision must be made for the condensation
to fl ow freely to a point to which it can be released, i.e. a drain or gully. The
condensation drain from the fl ue must be constructed from non-corrodible material
not less than 20 mm diameter. Copper or copper based alloys must not be used
for condensation drains.
For testing, the fl ue pipe should include a sealable test port.
Ideally the test port should be at least 450mm away from the air heater fl ue connection
socket. However if a concentric fl ue fi tting is attached directly to the connection sockets
then the combustion should be tested through the fl ue outlet collar via a drilled test port
which must be securely plugged on completion.
Follow the fl ue pipe manufacturers installation instructions for making joints, including
connections to the air heater, for passing through a building element and for support
requirements.
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