Early naturally ventilated buildings relied purely on a passive stack that acted like a “chimney stack” to exchange indoor and outdoor air. However, its effect was limited especially on peak summer days because the temperature in the passive stack has to be some 10°C above the room temperature, and often led to overheating.
Windcatcher is more than just a passive stack. Its unique design incorporates wind-driven air intakes to generate a positive pressure in the room below, which together with temperature differences, assist the passive stack to exhaust the stale room air. Best in class, Monodraught Windcatcher have an enviable reputation having performed consistently, effectively and reliably over the last 3 decades.