This group consists of an aluminium pressing with 5 blades. The diameter range is from 140mm (5.5″) to 305mm (12″) with various pitch angles and can be either clockwise or counter-clockwise rotation. Attachment to the motor can be pad fixing (U.C.P) or with hub to fit parallel shaft. Bore diameters are from 8mm (5/16″) to 16mm (5/8″). Zinc Plated steel hubs are secured by set screw. Air volumes vary from 90 to 1850m3h.