Attic Fan With Separate Automatic and Always On Settings

I am looking for a gable attic fan that can be wired to a wall switch and has three modes:
1) Always on
2) Automatic on depending on inside temperature reaching some threshold.
3) Always off
Ideally I would like to have the wall switch have three positions that correspond to these three modes.
Does anyone know of a product that handles this application off the shelf?
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