Fireproofing system for metal ventilation duct comprises plaster and vermiculate mixture applied to supporting layer fixed to rectangular frames

摘要

The fireproofing system for a ventilation duct (1) made from rectangular sheet metal sections (2) joined end-to-end by flanges (3) consists of an outer coating (11) of a plaster and vermiculate mixture applied to a supporting layer (9) fastened to rectangular frames (4) spaced at intervals along the duct. Each frame is made from assembled rectangular U-section metal profiles (5), and the supporting layer of expanded metal is fastened to them by self-tapping screws (10).