Exhaust fans shared circuit

[Nate H.]

I'm currently designing the electrical system for a small library in Washington and there are existing panels with limited spare breakers, so, I would like to consolidate three exhaust fans onto one 20A breaker . How do I calculate the load of the three exhaust fans to ensure that if all three of them are running at once it won't overload the circuit?

 

[PaulMmn]

Are these restroom exhaust fans?? Or is there a kitchen involved?
What size breakers are the fans currently on?

 

[Nate H.]

Bathroom exhaust fans that are being installed on 20A breakers.

 

[LarryFine]

Welcome to the forum.

A 20a circuit should easily handle that and more.

 

[ptonsparky]

1.25 times the largest motor amp, plus the other two.