... consist of impeller,case,air inlet,adjusting door,transmission,motor,system integral pedestal.3.Blades angleThe export position of ... the fans can be made in accordance with the clockwise and counterclockwise with 0°,45°,90°,135°,180°,225°4. ... damper, damper, electric actuator, motor with variable frequency and speed regulation, frequency converter, soft starter for motor;-Impeller is adjusted by the ...