OK, on the 1205 (and other models) there is the slide for closing the exhaust port. When the port is closed, this forces the exhaust to vent out the slits in the top-both sides. It 'seems' that the vacuum runs cooler with the slide open. Even putting your hands on both sides of the vents with the door/slide closed, the machine doesn't seem to put out as much exhaust. I wonder/worry about this a bit. I'm happy to run with the slide open, if it means the motor will run cooler....?
Kevin
Kevin