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I have a whole house exhaust for my bathroom. I will be adding on to my home & putting in another shower and WC. I want to figure out how to have this fan turn on if ANY (and ALL) of the 3 switches are on, and therefore only turn off if ALL of the switches are in the OFF position. How can I do this ?
 

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to have this fan turn on if ANY (and ALL) of the 3 switches are on, and therefore only turn off if ALL of the switches are in the OFF position.
It's an OR function, implemented as posted above.
". . .a logical operator that results in true whenever one or more of its operands are true."

The "and ALL" can be an AND function.

If you want control from all switches you need 2 ea. 3-way switches and a 4-way.
 
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