... velocity, in the range of 0.15 and 0.5 metres per second as stated in ''Building Services Technology and Design' should be the target. Natural ventilation allows air to pass through the building by means of ventilation bricks and vents and ducts allowing air to flow in a controlled pattern replacing used air with fresh. Natural ventilation works best when there are openings at both high and low levels of buildings to create buoyancy, which is also known as the stack effect. I would advise the client incorporate air vents in both high and low levels and have them mechanically controlled by a Building Management System (BMS) to ensure the best performance. A passive stack can be generated through large open spaces, as they have little resistance to air flow; this is why atriums are featuring more in construction today. I would recommend the building incorporate a high thermal mass (HTM) design; this would ...

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