Extra cooling can be provided by fitting a fogging system to the fans. A separate fogging system only works in combination with fans, whereby measures should be taken to prevent extreme humidity. A ring of high-pressure (70Bar) spraying nozzles can be mounted to the fan, with a time clock or special regulator ensuring regular water atomisation. The very fine droplets evaporate quickly, lowering the air temperature by some 3 to 4°C.