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The fan is probably a 115 VAC single phase fan and the outlet is probably a 230 VAC "two phase" outlet.

The fan would then have the following wires: hot (black), neutral (white), and ground (green).

The outlet would then have the following wires: hot #1 (black), hot #2 (red), neutral (white), and ground (green).

Pick either of the two hot wires on the outlet and connect the hot wire of the fan to that (ignore the other hot wire on the outlet) and connect the neutral to neutral and ground to ground.

If the wire colors are not as I described above you may have something else (e.g. 3-phase) and that would be wired differently, but those systems are usually used only in industrial settings not the home.

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Q: How do you wire a 3 wire exhaust fan to a 4 wire outlet?
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