If you are speaking of the dash air, not the Coach unit. that would be a chassis part and likely come from an auto parts store. So do you have the chassis year and model like Ford, Chevy, etc? That should be on a label next to the driver if in doubt.
Rv are usually built on a stripped chassis from those folks and the blower will likely be just the standard issue item for the type truck chassis it is built on.
Once you find what chassi you have, then online stores will offer different motor options.
A second good way to sort the question is to take the motor out and let the parts guys match it!
I would add that it is important to make sure it is the motor at fault and not one of the small parts, like controls or resister pack that change the speed as they are far more frequent problems than the motor itself!
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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