Power comes into 2 gang using 14/2
- 1 switch to power vanity light using 14/2
- 1 switch to power fan/light combo using 14/3

Question:
1. Do I need a 3 way switch (terminal screw) for fan/light combo?

 

You do not want a three way switch. Three way switches are for when you want to control something from two locations.

You want a single pole or two single pole switches if you want independent operation of the fan and light.

 

@pcboss: thanks. Given there are 2 hots with 14/3, how are the wires configured with regard to the switch and power coming in?

 

If you want to switch the fan and light separately (which you can do with the 14/3), you will need 3 switches in the box:
1 for vanity light
2 for fan/light combo

You can do this one of two ways:
- Cut out old box and install an old work 3-gang box
- Use a double stacked switch for controlling the fan/light

Once you decide, we can help you with wiring. It's pretty straightforward.

You also have the option of keeping only 2 switches, but the fan and light will be switched together and that defeats the purpose of running 14/3

 

Correct. I thought is to use a double stacked switch for controlling the fan/light.

 

At the switch box you technically have 3 switches; 1 normal and 1 stacked.

- Connect source neutral to 14/3 neutral going to fan/light and neutral going to vanity light
- Connect 2 black pigtails to source hot wire. 1 hot will go to vanity light switch terminal, doesn't matter which one. Other hot will go to stacked switch common terminal. Common terminal will be marked (dark) or letters embossed on back of housing.
- Hot going to vanity light will be connected to remaining terminal on vanity switch

The fan and light:

- The 14/3 red and black wires will be connected to the stacked switch brass terminals, there are two. I would put light at top and fan at bottom.

 

Do not break the tab on the duplex switch.

 

The stacked switch has 2 black terminal screws. How is this handled?

 

As I wrote the two black screws of the duplex switch have a tab between them that is not removed. Therefore you only need to connect to one since they are electrically connected. (It doesn't mater which screw.) If the tab has been removed post back.