I picked up a used $10 Nutone 300 cfm vent fan that I want to use over
my welding table. THe problem is that the fan motor runs - slowly (it
is rated at 1600 RPM). THe exact replacement motor is the same cost
as buying a new fan asm (about $155+). THis is a 3.3 inch (dia),
single speed, double shafted shaded pole motor. If I open up the
motor can, is there any hope of a minor repair? I have already lubed
the sleeve brgs - no change in RPM. Running it for 30 sec to a
minute, the motor sounds OK and the motor does not heat up, nor does
it smell burnt.

The Nutone motor number is 58840. It looks like Grainger has a
similar motor (hex mounting feature on the ends, but w/ 0.25 shaft dia
instead of 5/16). I could always turn some sleeves. I have also
found a Fasco D367 where I would need to modify the mounting of the
motor to the blower housing and cut down the shaft length but the
shaft dia is correct at 5/16. I still need to stop at either the
orange or blue big box and see what other vent fan options/prices are
available.