Smoke extractor for a flap or dome light hinged to a frame and a method for determining snow load on a sky or dome light

摘要

The device (1) has a dome and/or-flap or dark flap (3) arranged at a frame (2) or a trim (5), where the frame is set on a roof area (4). The flap is pivoted to be closed during fire from aperture element position and opened into the element position by a controllable mechanical device (6). A smoke-and/or fire alarm or a heat detector is located in active connection, and the mechanical device pivots the flap into an angle layer of more than 90 degrees to the frame. An optical sensor or electrical-or electronic sensor measures and/or determines surface load (q) at and/or on the flap.