1104UESAGBEN, page 13/31
Figure 7
6.2.2 Flues for power vented installations (type B appliances)
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 sup-
ply for combustion and ventilation is provided within the building in accordance with
BS6230/BS5440 plus other relevant regulations & rules in force.
Single wall
fl
ue pipe seamless aluminium pipes are required. All joints must be sealed
to prevent products of combustion from leaking into the building.
As condensation is unavoidable, provision must be made for the condensation to
fl
ow
freely to a point to which it can be released. Always use a slope of 1° (17mm/meter per
horizontal pipe) ensuring that the condensate
fl
ows to the
fl
ue drain.
Figure 8
Type B appliances :
combustion air and
fl
ue
pipe sockets
AIR INLET
FLUE OUTLET
Do not install vent piping near any source of heat (steam lines, radiant heaters, etc).
Minimum dimensions
D = minimum 130mm
C = D + at least 50mm (min 185mm)
Flue condensate drain tap
