Please check the video and picture.
Fan rotor blades are not well balanced and the stator is ruined in manufacturing process. The rotor support structure in one of the for support beams is too close to fan blades and blades will touch the support beam. This will make a noise and you need a special tools to remove extra plastic.
Most probable there are a big number of same type of fans currently manufactured wrong and these fans are not tested in the production line.
I would like to have a refund or an another fan as replacement.
Thanks.













