8
ComfoAir 155 WM
2.7 Ducting Guidelines
2.7.1 Please refer to design drawings for proposed ducting layout.
2.7.2 Four spigots are provided for connection of the ducting;
• ComfoAir 155 WM - 125mm nominal diameter
Ductwork should be securely connected to spigots. Failure to do this will cause unnecessary air leakage and
impair performance. Ducting must be connected to all four spigots according to right or left hand configuration
(See Section 2.3 for Configuration).
It is recommended that a minimum distance of 200mm is maintained
between the ComfoAir 155 WM and any ducting bends.
2.7.3 To prevent condensation, ensure that the intake and exhaust ductwork from the unit is insulated.
2.7.4 Where ducts are exposed in unheated areas, such as roof spaces, they must be insulated with at least 25mm of
insulation.
2.7.5 If applicable, Fire Dampers
MUST BE FITTED
in accordance with Part B of the Building Regulations.
2.7.6
Rigid Ducting
• Install using the fewest number of fittings to minimise resistance to air flow.
• Where possible, final connection to grilles and unit should be made with a flexible connection.
• Mechanically fix ducts using metal jubilee clips and appropriate non-hardening sealant for air tightness.
WARNING: Do not use screws for connection and ensure jubilee clips
are not over tightened.
2.7.7
Flexible Ducting
• Ensure ducting lengths are kept to a minimum and ducting is pulled taut so that it is smooth and straight.
A maximum of 300mm should be used on each spigot.
• Mechanically fix ducts using metal jubilee clips and tape seal for air tightness.
W ARNING: Should be in accordance with local Building Regulations.
Figure 1 - Close up view
of condensate
Figure 2 - Front View
Figure 3 - Side View
Min 5º fall
