3 way switch wiring..
im currently fixing a furnace blower for a shop fan. The blower has 3 speeds..low,med,and high. I want to add a switch to power each speed.. I was told i would need 2 3way switches and 1 reguar switch. I have wired up switches before but not 3 way.. can someone explain how to wire up these 3 way switches so each blower speed works seperately and only one switch can work at a time. For example if low is on i cant turn med on until low is off etc..can someone put me on the right path..thanks for help