Hmmm...that boggles my mind a bit too, I've seem posts elsewhere where inverting the fan blades fix that. Oh well. if the range hood is similar to ours, you should see a metal cover over the wires behind the switch. One screw holds that in place. Our fan had one wire (postive) going to a switch with a slide on connector and the other wire went into a wirenut for the negative side (with two white wires). Both wires on our fan were black, so I wonder if the fan is actually reversible. There were no markings on the fan to show + or -, either.
Fred
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