Using principles first expounded by Bernoulli and Venturi in the 18th century, Architect Ean McDonald created his E-Vent® natural ventilating system, now available in various forms from Combined Metal Industries. Bernoulli propounded that the pressure of a moving body of air or water is least where the velocity of the mass is greatest. In simple terms, by accelerating an air flow across a given surface or opening, a pressure differential can be created to produce a natural force and that harnessed force can produce power.
It is applied in aircraft flight and venturi systems generally. E-Vent®’s harness this natural power by creating low pressure areas on the upper and downwind sides of the vents creating a natural and effective exhausting air pump. That in turn means that air at normal pressure within a building will be literally sucked out by wind flow. And on the stillest of air days, E-Vents® still work by reason of simple convection or ‘stack effect’.