| 摘要 |
A fire gas vent whose frame (11) is supported by a mountable attachment frame (12) round a roof opening of galvanised steel plate or the equivalent. In order to securely hold a protective grating (18) in the attachment frame via screw unions (21) or an equivalent attached element (19), most suitably a T-profile (19a) whose one leg (20a) is recessed in a notch in a ledge (15) outside of the plate frame (12).<IMAGE> |
