[akw1886]

Can I change a four wire exhaust fan with a three wire exhaust fan both same size?

[akw1886]

Can you change a four wire exhaust fan with a three wire fan on a rheem a/c

[mygirlsdad77]

What fan are you asking about. Draft inducer, or blower motor? If you can give a little more info we will try to help. Pictures always help.

And, are you talking about the outdoor unit(ac) or indoor furnace unit.

[Joshdta]

If you are talking about the outdoor fan motor, yes you can but you need a new capasitor.