Never thought about the steam shower
Could you try this and see if it works for you. I am guessing you are going to need it to run normally but when you have a steam shower you will need to do something to tell the automation you are having a steam shower. As a test before you go crazy and maybe use your voice to toggle the helper could you create a toggle helper and set up the bypass as shown below.
I created a toggle helper called āSteam Shower Toggle Helperā. What will happen is when you turn ON the āSteam Shower Toggle Helperā the fan will turn OFF. Then we enabled the bypass auto OFF and set the time for 15min. You donāt need to do this you can manually turn OFF the āSteam Shower Toggle Helperā if you like. If you do use the auto OFF it will then turn the āSteam Shower Toggle Helperā OFF in 15min as per the setting.
This is a link to another blueprint of mine but is shows you how to create a toggle helper if you are unsure. Click Here
Let us know if this works for you.
Blacky