Technical data

0803UDSA-2GBEN, 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 flue pipe as determined in table 5, attach either the flue
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 accor-
dance with BS6230/BS5440 plus other relevant regulations & rules in force.
Gasket sealed single wall flue 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 flue 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 flue must not exceed 65°C when the heater is in operation.
The flue must be at least 150 mm away from any combustible material.
Single wall flue pipe exposed to cold air or run through unheated areas should
be insulated to avoid condensation. Provision must be made for the condensation
to flow freely to a point to which it can be released, i.e. a drain or gully. The
condensation drain from the flue 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 flue pipe should include a sealable test port.
Ideally the test port should be at least 450mm away from the air heater flue connection
socket. However if a concentric flue fitting is attached directly to the connection
sockets then the combustion should be tested through the flue outlet collar via a
drilled test port which must be securely plugged on completion.
Follow the flue pipe manufacturers installation instructions for making joints, in-
cluding connections to the air heater, for passing through a building element and for
support requirements.