Rotary Positive Blowers are approved by leading consultants confirming to BS : 1571 Impellers are machined on imported milling machine from one piece fine grain iron castings. Strong Shafts of high carbon Steel are carefully turned and fitted into impellers. Timing gears are cut from solid blanks and generated on the finest precision equipment. Every blower is tested and operated before release, to assure good operating conditon and trouble free service.