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Thanks for your suggestions guys, i didn't realize that the difficulty of my problem was in the category of 'rocket science'.

The duct work is fiberglass. Your question as to is it oil canninig gave me an idea. The blower itself is attached to its sheetmetal enclosure. Maybe the external enclosure wall that the blower is attached to is flexing due to the torque of the blower -- hence the noise. Not much I can do about...

The motor is single phase 2-pole, 240VAC. The offensive noise is the initial air rush through the duct work. If there is any play in the doors in the house I can hear one or two bang slightly closed ( i can fix that part of it ). There is a slight boom as the motor starts up. I think it is due...

the reason for this question was the blower makes noise when starting and I was hoping to cut down on that by ramping up the blower to speed.

I have a 2HP 240V blower motor for which I would like to vary the speed from my plc. The motor is a standard HVAC type blower which is belt-driven from a motor. Any inexpensive suggestions as to how I may use this motor or do I have to replace it with another type. I'm in the process of...