8
Ducting Guidelines
A 100mm nominal diameter spigot is provided for connection to ducting.
Ductwork should be securely connected to fan spigot. Failure to do this
will cause unnecessary air leakage and may impair performance.
All duct connections require sealing. Where ducts are installed against a
solid structure this can be difficult to achieve. In such locations
preassembly of duct sections should be considered. This will require that
connections are permanent to ensure the seal is maintained during
installation.
If applicable, Fire dampers MUST BE FITTED in accordance with Part B
of the Building Regulations.
Rigid Ducting - Install using the least number of fittings to minimise
resistance to airflow. Where access to ducts will not be possible after
construction is complete, i.e. within floor and wall voids, consideration
should be given to permanent connection and sealing with an appropriate
non-hardening sealant, and not using duct tape to achieve connection and
sealing.
Flexible Ducting - Ensure ducting lengths are kept to minimum and
ducting is pulled taut so that it is smooth and straight. Where bends are
necessary, and where ducting is run in restricted areas, ensure the
ducting is not crushed. Connection of lengths of flexible duct must use a
rigid connector and jubilee clips or similar to ensure a long term seal is
achieved. Connection of lengths of flexible duct should not be taped-only.
The fan exhaust must terminate to external air and be protected by a
suitable wall or roof terminal. Roof terminal to have a minimum equivalent
free area of 7,500mm
2
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2.5
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
2.5.6
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