| http://www.w3.org/ns/prov#value | - Smoke blocking can easily be obtained by integrating a smoke blocking device or adding one in series as prescribed for smoke and fire dampers by current regulation (ICC in USA).BRIEF DESCRIPTION OF THE DRAWINGSThe invention will be further described below with reference to the drawings, in which:FIGS. 1 and 2 are a front view and a schematic cross section, respectively, of an embodiment of the inv
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