Construction:
- fire ventilation grilles, class EI90
- fire ventilation dampers, class EI90
Design:
- in wall (ventilation grille)
- in leaf (ventilation grille, damper)
Useful area:
- grille up to 60 % net
- damper up to 80 % net
Installation:
- galvanised steel sheet
- expanded materials
- meltable fuse
- protective net
Finishing:
- galvanised, or
- plasticised in RAL colours
Thickness: 125 mm in door leaf