Not sure if this is really a plumbing question but it has to be close. If I am building a bathroom in my basement and I am only putting in a whirlpool tub will I still need an exhaust fan? If so do I just run a vent pipe from the exhaust fan straight out the side of my house?

If I remember correctly a bathroom requires a 'local vent'. This could be a window or a fan. Funny thing is most never open the window so they still have no local vent.