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4.1 Foundation
Recommended are solid foundations of reinforced concrete, as shown in Figure 24 left, or strip
foundations, as shown in Figure 24 right. For strip foundations, concrete or steel beams shall be
used, see Figure 24 bottom-right. Steel beams constructions must have an appropriate stiffness in
relation to the unit size. The foundation must be flat and leveled, it may not have fall in any direc-
tion or uneven surfaces.
The AHU parts should be supported by underlayment specified in section 4.2 (Erection). The
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distance between these underlayments is not permitted to exceed 1.500 mm.
The height difference between 2 neighbouring underlayments should not exceed 2 mm.
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The total height difference is not permitted to exceed 2 mm. This means that the difference in
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level of all underlayments together, has to be within the range of 5 mm.
Attention!
If these demands are not met, this may be the cause of jammed doors and other problems with the
AHU.
Figure 24: Solid foundation and strip foundation
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