[randallsho3]

I would like to add a timer to our bathroom fan. The fan also has a light and heater connected to it. I only want the timer on the fan. I drew a picture of the way it’s currently setup and it should be attached. Let me know if you have questions. Thanks so much!

 

[Oldmaster]

I cannot enlarge your drawing enough to read it but if you have a separate wire feeding the fan install the timer on that wire.

 

[surferdude2]

I don't think you have enough wall box to do that without giving up the heater and light switching. I also don't see a neutral in the wall box that will be required, if you are considering an electronic timer.

 

[RRH]

This is what you need
https://www.amazon.com/gp/product/B002WTC91K/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

But cant make sense of your drawing. Cant tell what is what. I see hot with breaker off. Then looks like you are coming off that with two Hot lines but then change them to white lines.

 

[huesmann]

Are the light, fan, and heater all on separate switches? Then the switch RRH linked you to should be the solution (they also make the same switch with different intervals, FYI).