I have a 3/4 HP dust collector which uses an induction motor. I bought it on the assumption that the fact that it uses an induction motor means that it shouldn't be too loud, but it sounds like a jet engine. I suspect that the sound is not generated by the motor but rather by the fan. Is there something that can be done to lower the sound coming from the fan?
The dust extractor I have is similar to the one in the photo below, but the dust filter is fabric. The layout of the parts is identical, the motor is on top with nothing covering it, the filter and dust bag's location is the same.