When my parents were living with us they both chain smoked. We installed several hepa filters, and it did help, but the filters had to be thrown out every month as they would be completely covered in tar and other gross stuff. I cannot imagine what that does inside your body.
Can you convince them to smoke outside?

The vent is about 5 years old and it does work, the vent and unit is clean, itjust when he exits there is alot of smoke. I have no idea whst ceiling fan to buy for a 2piece bath and stacked washer&dryer.

The air filter sounds good. Is that wired in? And does it sit high or row

A bathroom normally is not in the center of a house that's a little confusing and usually has a window that can be opened that being said most bathrooms especially Master bathrooms come with an electric ventilation switch next to the light switch that will suck all humidity out of the room and usually is good for cigarette smoke as well or other things. That being restricted there are also choices of small plug-in air purifiers that do work fairly decently as long as he is not in their chain smoking

I found a vent fan that has a cdr of 150. Super powerful.

I am researching filters but i need an extra plug


Thanks all for your support

I’d look into getting a good ionic air purifier.

There are some room air filters - I’ve never used one.

https://a.co/d/cZInsLW

where its the warmer months now can he set up a window fan somewhere theres a window and blow the smoke out of it like sitting in front of it?

You may be able to use a high quality air filter.

An inexpensive air filter can be made with a standard box fan an an appropriate-size HEPA filter that can be bought at a hardware store.

Every bathroom has a window? Isnt that s fire code law?

Put a fan in the window to suck the air out