This range of Wolter fans is the result of many years of research and development. The efficiency of all the fans is guaranteed through specific volume figures at maximum pressure differentials. Excellent performance and minimal noise levels are the features of this new fan range. These centrifugal fans are designed for the conveyance of clean air and non-aggressive steam and gases at a temperature range from -30°C to +80°C (22°F to 176°F).