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FIGURE 5. AIRFLOW DIAGRAMS (Cross section view from below)
8.
DUCT & DUCT CONNECTIONS
(Refer to design drawing)
8.1
Four 100mm/125mm nominal diameter spigots for connection of the ducting (see diagram for positioning of
the spigots Figure 1). These must be connected to the supply and exhaust duct.
8.2
NOTE:
Where rigid ducting is used it must fit outside the 125mm spigots for 125mm ducting and on the
inside of the 100mm spigots for 100mm ducting.
IMPORTANT:
When inserting 100mm ducting into the spigots ensure it is no longer the 43mm.
8.3
Where rigid ducting is used, it should be installed using the least number of fittings to minimise resistance to
air flow. Where possible, final connection from the rigid ducting to grilles and the unit should be made with
a flexible connection.
8.4
The duct layout must be designed to suit the requirements for the ventilation/recovery system and building
layout, and suitable fire dampers MUST BE FITTED to protect against fire being transmitted through the
ducting,
where specified
.
8.5
The inlet for the fresh air supply can be direct from outside or from within a ventilated roof space. If the
supply is direct from outside, it must have an external wall baffle fitted if supplied through a wall, or a
recognised roof terminal if supplied through a roof.
8.6
The exhaust air must exit to outside through either a wall or a roof and must be protected by a wall baffle or
recognised roof terminal.
FIGURE 6. AIRFLOW THROUGH UNIT
WARM FRESH
AIR INTO
ROOM
EXHAUST
TO
OUTSIDE
FRESH
AIR
FROM
OUTSIDE
WARM AIR
INTO ROOM
FRESH
AIR FROM
OUTSIDE
EXHAUST
TO OUTSIDE
BATHROOM STALE AIR EXTRACT
BATHROOM
EXTRACT
