Insulations made of mineral - stone or glass wool - are used in diffusion systems to maintain the temperature of the air supplied into the rooms.
The wools are fixed to the ventilation ducts by means of nails.
Self-adhesive nails are used for rectangular ducts which have flat surface, nails for welding and reverse pins for welding can be used on any surface.
To prevent ungluing of the insulation, they are connected by means of an aluminium tape which is also used to insulate the spiral ducts.
The duct type repair tapes or PVC tapes can also be used for the spiral ducts and the flexible hoses.