The Monodraught WINDCATCHER® natural ventilation system channels a controlled quantity of fresh air into a room from roof level, whatever the wind’s direction, and without mechanical assistance. The WINDCATCHER is divided internally into four quadrants so that one or more face into the wind. Here, windward quadrants supply air under that action of positive wind pressure, and leeward quadrants extract stale air under the action of negative wind pressure. On still days, the WINDCATCHER acts as a conventional passive stack using natural buoyancy to stimulate air flow through the building. Volume control dampers located at ceiling level vary the rate of ventilation according to the building requirements via a control system. In addition, during summer months the dampers can open at night to provide night time cooling, which can help to reduce peak internal temperatures. The Monodraught WINDCATCHER system eliminates the need for air conditioning without compromising the security of the building.
