AirTech AIR+ PIV/L Installation & Commissioning Instructions - Page 6
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DIFFUSER GRILLE:
The diffuser must be carefully sited to ensure the maximum effectiveness of the
system. It should be fitted in the ceiling of a common area, ideally above the landing
so that the incoming air can reach all the rooms.
Cut the flexible ducting to a suitable length, where possible stretch the ducting to
its maximum extent and ensure that there is one continuous smooth bend to the
diffuser. The ducting must remain a minimum of 1m in length.
Remove the loft insulation from the location of the diffuser and cut a 240-260mm dia
hole in the ceiling.
Ensure the four locking tabs are folded in and then push the spigot in to the hole.
Holding the diffuser in place; screw the four screws until the locking tabs are
holding the diffuser tight against the ceiling. Fig. 5 It is important not to over
tighten these screws as this may warp the diffuser.
Fit the free end of the flexible ducting to the diffuser spigot using the worm drive
clip supplied. (Fig 7)
Fig. 6.
Fig. 5.
IMPORTANT – SMOKE DETECTORS: The diffuser should not be situated within 1m of
a smoke detector, however if this is not possible the AIR+ PIV
has provisions to blank off the airflow for up to two quadrants of the
diffuser. Two blanking plates are provided; these should be pushed on to the
support struts inside the diffuser as required. This should be done before the
diffuser is installed in the ceiling as when the screws are tightened down the
plates can no longer be removed. See Fig.6, showing blocking off opposing
quadrants, note any 1 or pair of quadrants can be blocked off as necessary for
the install. These block off plates can also be used to ensure the supply air
is spread across a room rather than directed at close by walls.
Blanking off one side reduces the flow by about 6%, but blanking off two sides
reduces the flow by about 20% and so if two sides are blanked off then you
should consider increasing the fan speed to maintain the appropriate airflow.
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