Some duct fan testing thrust data is obtained by blowing the air to the scale directly. This way would be increase the data measured. However, it does not reflect the actual thrust. Our Duct fan thrust data is obtained by using a testing stand, the fan is mounted on a sliding trolley and pull against a digital spring scale. It measures precisely the actual thrust the fan and motor combo produce.

In order to avoid misunderstanding, pleas note. The motor is balanced but the impeller is not balance, Buyer need to balance the impeller and install the motor into the fan unit.