Standard made in galvanized steel, inox or aluminium on request.
External insulation with heat-insulating adhesive polyethylene on first class of fire reaction (DM 26/06/1984).
Maximum operating temperature: 70°C.
PBO plenum are installed on the delivery vents, return grilles and other kind of terminal unity. The function of the plenum, or calm box, is that of delete or reduce the non-uniformity of the air speed profile, coming from the supply line. Thanks to that the launch characteristics and the air flow diffusion entered by the delivery vent will comply those provided.