We take great pride in the quality of our engineering. Our Natural Ventilation systems are designed in accordance with our company ethos: innovation, sustainability, reliability and performance. Confidence can be taken from the knowledge that our systems are tested extensively in house and by third party academic and research organisations to ensure that our solutions deliver the best possible results for your building.

About Natural Ventilation
Windcatcher Solves Problems
Why choose Natural Ventilation?

Natural ventilation supplies fresh air to a building or room by utilising the passive effects of wind speed or differences in internal and external air pressure. It is a sustainable, low carbon ventilation system that does not use fans or pumps making it extremely cheap to run whilst providing a comfortable and healthy indoor environment. Monodraught first launched Windcatcher in 1991 and have been constantly innovating our concept for modern applications. In the last two decades, nearly 27,000 Monodraught Windcatcher units have been successfully sold and installed in UK, France, USA and New Zealand.

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.

Windcatcher is the perfect solution for new or refurbished buildings that require the benefits of sustainable, low carbon and secure natural ventilation.


  • School classrooms, dining rooms, science rooms
  • Lecture halls and libraries
  • Sports halls
  • Offices and reception areas
  • Visitor centres and restaurants
  • Prisons


  • Proven track record
  • Enhances your energy and carbon saving credentials
  • Extremely quiet in operation
  • Easy to integrate

Building Owners

  • Contributes towards sustainability targets
  • No running costs
  • Easy to maintain
  • Fast payback


  • Enhances your energy and carbon saving credentials
  • Robust and easy to install
  • Easy site preparation
  • Easy wiring preparation

Occupants / Tenants

  • Healthy indoor environment
  • Quiet with no noise disruption
  • Easy to use
  • Sustainable energy

“In response to updated building regulations, Tesco has included energy saving and sustainable initiatives, and as one of the key suppliers, Monodraught was involved early in the planning stage, later supplying Windcatcher X-Air systems aerodynamically designed to deliver the optimum ventilation rate to extract stale air from the main sales area of the store and introduce fresh, naturally-ventilated air”

Karl Myhill

Woods Hardwick, Commercial director – Tesco-Corby

"The systems have regulated the internal temperatures without any outside assistance."

Greg Allen

Facilities Manager at St Joseph’s College

"We are all aware how difficult it is to study and work in a stuffy and warm environment and this was one of the key factors in the College’s decision. After all, what could be more energy efficient than ‘free fresh air'."

Phil Evans

Energy Manager - Imperial College

"The existing school was naturally ventilated but only by manual windows opening. The Windcatcher X-Air system was chosen for the simplicity of its implementation during the construction, its good control system and low maintenance."

Olivier Zanni of Tribu, Lyon

Vancia School

Monodraught Windcatchers were the ideal solution and the entire facility now stays cool and refreshed, even when full of students letting off steam”. He adds “that once installed, Windcatchers maximise the use of wind pressure and the natural stack effect of thermal buoyancy, which means schools reap all the benefits of sustainable energy and incur no running costs.”

Richard Mapp

Business Manager - Performing Arts Block of the Hazlemere based Sir William Ramsay School

"I was impressed with the simplicity of the Windcatcher technology.  The roof mounted units are located well above the heavy pollutants on the A2 allowing fresh air to be drawn into the heart of the building.  Acoustic lining in the ducts of the Windcatchers has reduced noise ingress to 38 dBa, which is well within the noise design limits set by the Acoustic Consultants."

The Architect, Guy Shackle

Addey & Stanhope School

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