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These chads add up: About eleven tons have to be conveyed per hour, around the clock, over a distance of 50 metres with several 90°-bends to a height of about six metres. Up to now for the generation of the negative pressure required for vacuum conveying Johnson Controls used positive displacement blowers made in America. However, for Ahmad Abu-Shagra, Project-Manager at VARTA-factory in Hanover, these blowers have serious disadvantages: They are noisy, require comprehensive maintenance, susceptible to malfunctions and above all only comply with the German regulations after costintensive modifications. Therefore in 2010 when establishing a new production line for the factory in Hanover they decided for a positive displacement blower made by Aerzener Maschinenfabrik.
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