AOV Glazed Sliding Smoke Vents These huge electrically operated sliding glazed roof hatches also provide free airflow of 7m² for smoke ventilation! These bespoke designs were part of a redevelopment on Great Portland Street in London. The covers were 4610 x 1955mm and featured an electrically driven opening motor. The covers provide 7m² free air flow (As it is sliding there are no obstructions to the ventilation) according to approved document B (fire safety) paragraph 5b diagram C.7. A further fixed rooflight was also supplied to the size of 4935mm x 1955mm, the multi-pane rooflight provides natural daylight.
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