Ventilation for indoor smoking

I'm sure I don't know as much about Flatsix, but as I understand it, don't go overboard on the CFM's (especially if you have a gas or oil furnace), size it properly to the room. Also as far as I could tell (as of a few years ago) Panasonic seems to make the quietest bathroom fans, if that is how you are going to power it. I believe they also make very powerful inline fans too. I don't have any of these things, but I did a fair amount of research for a pet project that never got off the ground. Good luck with yours!