Positive displacement blowers were introduced as a more efficient water wheel. Made of wood, a blower was placed into the millstream and as the water flowed through it, the rotors turned and power was generated for milling from the output shaft. It worked well except for a minor flaw; the wood would swell up and ruin the clearances and the mill would stop. The unit would be taken out of service and dried out, shrinking the parts to their original dimensions. 

In an effort to speed up the drying, as soon as the rotors would turn, a power source could be connected to the output shaft and the rotors spun. Someone noticed that the arrangement would move a large quantity of air and the use as an air blower began. 

Blowers are warranted by the manufacturer and supported by a blower dealer for one year. The warranty covers defect of material or workmanship. If there is a failure of any type, the blower must be removed from the truck and shipped to the blower dealer or manufacturer. 

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