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4.2.4 Special guidelines for flat units – ceiling units
Usage
For the suspension under a ceiling.
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Assembly of the individual components of the flat units
The individual components are screwed together by use of comfort compound – see Figure 30.
The assembly should still be done on the ground, since the comfort compounds on the top side
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of the flat unit may no longer be accessible after positioning on the ceiling.
Suspension
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The dimensioning of the suspension and fixture must be carried out on site and has to be
adapted to the size and weight of the flat unit.
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All necessary material for suspending and fixing the flat unit on the ceiling, like longitudinal and
transverse profiles for bottom side, threaded rods, dowels, etc. must be provided by the cus-
tomer.
The suspension can consist only of transverse profiles (transversely to the air flow), as shown
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in Figure 31, or of transverse profiles with additional longitudinal profiles (longitudinal to the air
flow), see Figure 32.
In order to prevent deflection of the bottom panel, the maximum distance of the supporting pro-
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files should not exceed 1 m to each other.
Profiles must be positioned so that downward-opening doors, processes of wells, etc. are not
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blocked by them, see Figure 31.
Longitudinal profiles are intended to support the aluminium profiles on the bottom edges of the
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flat unit.
Furthermore, it is recommended that the supporting profiles should be screwed together with
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the aluminium profiles of the bottom edge for secure positioning e.g. by means of threaded riv-
ets.
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To avoid transmission of structure-borne noise is recommended to use sound-absorbing mate-
rial between suspension and unit. A possible solution is shown in Figure 28.
Figure 30: Comfort compound
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