Monodraught’s WINDCATCHER® X-Air natural ventilation system is unique among roof mounted natural ventilation systems as it features ACTIVLOUVRE® modulating aerofoil louvre technology. The ACTIVLOUVRE provides ventilation control at roof level and prevents weather ingress into the WINDCATCHER. The system comprises of an external set of static louvres and an internal set of active louvres positioned to give a constant width through the opening. The active louvres can be raised and lowered to vary the free area of the opening according to the control strategy.

The greatest air flow rates through the louvres are achieved when they are fully open, but the ACTIVLOUVRE system is able to modulate their position to increase the resistance of the louvre, or they can be fully shut to prevent the ingress of snow, which any open louvre system by definition is susceptible to.

The ACTIVLOUVRE is just one of the USPs of the X-Air system, which includes among others an external solar powered lighting system that is available in three different colours, and external air catchment fins that improve the ventilation performance in relation to the wind speed. The ACTIVLOUVRE technology is patented, as are the other USPs that the X-Air system carries, thus making the WINDCATCHER X-Air natural ventilation system the optimum choice for ventilation performance and weather protection.