ITF

26 FACILITIES GUIDE | JUNE 2020 Air-supported structures Air structures, more commonly known as 'bubbles' are relatively inexpensive and efficient to construct. Air structures usually comprise single- or multi-layered fabric, which are erected and supported using air pressure provided by substantial air blowers, which are also used to ventilate and control the climate within the bubble. The majority of air structures are constructed of woven polyester fabric, which is usually treated with a protective coating. This protective coating is used to block out ultraviolet light and to prolong the life of the fabric. The average life of a modern air structure is between 10 and 12 years. The fabrics used are can be opaque or translucent. Translucent fabrics permit a large amount of natural light to pass through them, which helps to trap and retain heat in the winter period, but can promote extremely high temperatures in the summer, which need to be controlled. The light usually passes through the fabric in irregular patches; therefore most air structures combat this problem by using interior lighting to create the optimum lighting for playing tennis. Opaque fabrics provide more constant lighting, which reduces the need for extra lighting during the daytime. The fabric also has a much better control of temperature in all seasons. Air structures still need to comply with building rules and regulations and must maintain safety of the public at all times, e.g. by avoiding the build up of excessive snow loads. Air structures can be erected at certain times of the year (usually autumn and winter) to increase the available court time. Courts should be designed to accommodate an air structure if it is likely one will be needed. An air structure must withstand local climatic conditions. The main advantages of an air-supported structure are they are relatively inexpensive to purchase and are easy to install. They can be easily maintained. They can be taken down during the summer, allowing play both indoor and outdoor.

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