1.Envisaging from Motor fan cover or Driving units angle , anticlockwise rotating is sinistrogyration;On the contrary,clockwise rotating is dextrorotation 2.The default rotation type for 4-72 blower fan of our factory is dextrorotation 0 degree Our service: Marketing Service 100% tested CE certified blowers.Special customized blowers(ATEX blower,belt-driven blower) for special industry.Like gas transportation,Medical industry…Professional advice for model selection and further market development. Pre-sales service: •We are a sales team, with all technical support from engineer team. •We value every inquiry sent to us, ensure quick competitive offer within 24 hours. •We cooperate with customer to design and develop the new products. Provide all necessary document. After-sales service: •We respect your feed back after receive the motors. •We provide 1years warranty after receipt of motors.. •We promise all spare parts available in lifetime use. •We loge your complain within 24 hours.