It depends on how you say it – they may whirl around, turn around, spin around, revolve around or even twist around however the manufacturers of these products totally misunderstand the concept for natural ventilation of the roofspace or roof cavity if you prefer.
TESTING DONE BY DEAKIN UNIVERSITY'S MOBILE TESTING UNIT MABEL
Mobile Architecture and Built Environment Laboratory. Using the latest testing technology for Sala Homes, Qld, found that a wind turbine does not move air, but is instead moved by air – the two very expensive turbine ventilators tested on a very small home with open eaves showed a flow velocity of approximately 0.1 metres per second in the wall cavities and the roof. This is considered to be still air in ventilation terms and is totally inadequate to remove any heat load from the walls or roof.
CONCLUSION A more effective roof cavity ventilation system requires further exploration – an excerpt of this report can be found in Case Studies & Reports on this site.
ROOF VENTILATION IS ALL ABOUT CIRCULATING THE AMBIENT AIR THROUGHOUT THE ROOFSPACE
To keep the roofspace fresh by allowing the ambient air to circulate throughout the roofspace and the stale air to evacuate the roofspace to decrease moisture levels that build up causing health problems and damage to the building structure. A cooler and dryer house are the bonus.
THE TWO FUNDAMENTAL BENEFITS OF AN EFFECTIVE ROOF VENTILATION SYSTEM ARE a cooler house in summer and a drier roofspace in winter.
The objective – to expose the roof cavity to the ambient air (the air that surrounds) to dry, cool, freshen and ventilate.
Universal Tile Ventilator Systems are the only roof ventilators that have inlets and outlets within the roof covering. Prepare to be amazed with the results you achieve.
FOR THE INLETS AND OUTLETS FOR ROOF VENTILATORS THAT DO WORK 24/7 365 DAYS A YEAR FOR THE LIFE OF YOUR ROOF OR LONGER, UNIVERSAL TILE VENTILATOR SYSTEMS FOR TILED AND COLORBOND ROOFS.
ANYTHING ELSE IS A COMPROMISE