40.5 x 40.5 mm, 40 mm Associated Fan, Fan Guard
40 mm x 40 mm Dc Axial Fan, Ball Bearing
40 mm x 40 mm Dc Axial Fan, omniCOOL™ Bearing
40 x 40 mm Dc Axial Fan, Ball Bearing
40 x 40 mm Dc Axial Fan, omniCOOL™ Bearing