| 摘要 |
A case, preferably consisting of sheet metal, for the installation of a fireproof flap, in particular the housing of a fireproof flap, in a wall opening has an outwardly projecting, first flange collar on one end side and an inwardly projecting, second flange collar on the respectively opposite end side. Each flange collar has a reinforced portion which is formed by crimping. The wall surfaces of the case are provided with stiffening profilings.
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