4.1 Foundation
Recommended are solid foundations of reinforced concrete, as shown in
foundations, as shown in
right. For strip foundations, concrete or steel beams shall be
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.
Figure 24:
Solid foundation and strip foundation
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The AHU parts should be supported by underlayment specified in section 4.2 (Erection). The
distance between these underlayments is not permitted to exceed 1.500 mm.
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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
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.
