4.2.3 General indications for the erection
The AHU sections must be precisely aligned and the front sides shall be exactly parallel to the oth-
er. If necessary, some minor corrections can be made by placing steel plates under the section.
After the prepositioning the AHU-sections can be pulled together with belts which act on the base
frame, as shown on
Figure 25:
Pulling AHU sections together
Figure 26:
Pulling AHU sections together (detail)
For noise insulation, it is recommended, depending on the location of the erection, to underlay the
AHU with cork, Mafund plates or Sylomer strips. The used absorbent material must be adjusted to
the load to achieve optimum noise insulation. The providers of such products indicate the respec-
tive design criteria. For the weight specifications see the technical data sheet. For standard units
without feet the maximum allowed distance between the layup points is 1500 mm. Floor units must
be fixed on the foundation to secure the position. A direct coupling, see
avoided because of structure-borne sound transmission. If you use structure-borne sound insulat-
ed underlayment, the fixing by lugs is particularly suitable to avoid the displacement of the AHU in
all directions (
Figure 27:
Securing the position on the foundation
If floor units shall be mounted on the ceiling, then the device must be fixed with the base frame on
an encompassing suspension see
right. The handling of the structure-borne noise insu-
lation is analogously as for floor units.
