I have a patton high velocity fan. Was originally a three speed fan but the switch failed and was switched out to a toggle type that just used a med speed. I found a pull chain type switch for three speeds I would like to change it out with but I think it might be for two speeds. If so I would like a medium and high setting. the power cord coming in has of course the two wired. the original motor has four.Red, Blue, Black, White. The switch hads three wires. Red, Blue, Black. Can someone kindly direct me, which wires to which?

Dryers - Patton - U2-1487 Floor / Box Fan