Exhaust blowers are used in particular in old buildings, for example in apartment buildings when several devices are fixed to a chimney. There is huge potential in markets outside of Europe, for example in Russia, China, or Iran. In China, there has been a sharp increase in the use of these devices, whilst at the same time the use of coal heating has been declining. As a result, exhaust blowers are playing an extremely important part in China’s efforts to reduce air pollution.