Metal frame for glass screens: firewalls, consisting of uprights and crosspieces, two through parallel links to said uprights and crosspieces to form frames for placement of a plurality of firewalls; These straps are joined together and with said crosspieces and uprights by engagement of parts of these bodies in complementary housings formed in the associated organs, characterized in that the encasement is provided with sufficient longitudinal play to allow free expansion of the frame under the effect of heat; in the most severe fire tests for the isolation of the windows, they have been satisfactory.
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