The kitchen fan did make noise. It sounded like it was running fine. There just wasn't any air coming out of the louvers in the front. I thought maybe it was ducted up through the roof. NOPE! I thought "maybe" it was ducted out the back, into a duct in the wall, then outside. So I walk around outside with the fan on to try to find the exhaust point. NOTHING.
That's when I looked inside the unit to get a close look.