| 摘要 |
A smoke vent assembly for the roof of a building has a panel 15 hinged to a frame 10, for movement between open and closed positions under the action of a powered actuator 60,61,63. The frame 10 is constructed at least in part from metallic inner and outer frame members 17,18 with thermal break elements 28,29,30,31 connecting together the inner and outer frame members 17,18 and with insulation 26,27 disposed therebetween. Each of the two opposed outer frame members 12,14 extending at right angles to the frame member 11 hinging the panel 15 defines a respective chamber 19 for accommodating a powered actuator 60,61,63. |
