"Cougercat" wrote in message
news:gb%Gb.663529$Tr4.1667477@attbi_s03...
Vent rotor motors work very well. These motors are used in HVAC systems
in
commercial buildings. They usually take 24 volts to operate and only turn
from 0 to a few degrees past 90. Most are settable.

Where do they come from?
I didn't get any hits on google, or ebay.