The suspended ceiling should be made of a non-pulverulent material (metal plates or slabs). It is strongly recommended not to use "mineral" type components because there is a risk of generating dust, owing to the disintegration of the slabs.
By installing a suspended ceiling (optional), it is possible to:
If wire or rock wool is used, it should be contained in a dust-proof bag or cushion.
Furthermore, the space between the suspended ceiling and the primary ceiling can be used as a plenum space for recycling the conditioned air (minimum height equal to or greater than 20 cm). In such a case, the ceiling and the down part of the walls should be treated with anti-dust paint.