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This pressure difference can be naturally occurring or, as in the case of Amoy Gardens, can be mechanically induced by building ventilation systems. Until the mid-1970s, building ventilation standards called for approximately 15 cubic feet per minute (cfm) outside air for each building occupant. Arup Zimbabwe have won the innovation category of the Worldaware business awards for their Vawtex -- vertical axis wind turbine extractor, which uses wind energy rather than electricity to power building ventilation and add to convection effects. |
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