The main GOCC spot in Poznan was the stage near the Castle. Every year, numerous concerts and auctions are organised for different charities. The MAKO company from Przezmierow was responsible for heating the stage throughout the event with mobile air heaters. Despite the changing and cold weather, they ensured that both artists and hosts on stage were kept warm and were able to encourage the audience to donate to the charity. It was agreed, that the 12 x 12 x 8m stage with a total surface of 1152m3 would be heated with two indirect oil heaters. BV 290 models were used, with a power of 81 kW each. When the heaters were selected the fact that stage area was not an enclosed spaces and there would be constant influx of cold air was taken into consideration. The heaters were placed

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