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Fred, I already tried that. The blades do pull off but when you turn it over they're pointing the same direction as before and pull air in. Sure boggled my mind for awhile. The blades on ours are white while the bathroom fan's were black.
The fan I put in the bathroom is a little larger than the oem fan. I'd have to go measure it but I think it's 4 inches. Like you, I re-used one mounting hole from the original fan location and drilled two more to give it support on 3 corners. I then just spliced the wires to the original switch. Works great!
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