The Centrex is a multi functional air blower / fume extraction unit which is powerful but compact. It moves up to 918 m3/hr (540 cfm) using a centrifugal design where the fumes are not in contact with the motor. The centrex fume extractor is used extensively in the tool hire, sewer relining and welding industries and in fitting shops where petrol and diesel engines have to be tested and run for some time.