If u have ur fan/filter on a timer with ur light like i do and it turns off at night then yes ur room is going to stink..not just in the tent but outside aswell..
EXAMPLE: Ur tent is in a spare bed room, ur fan/filter turn off at night, if u go into the spare bed room u will smell pot and it will leak out into the rest of ur house!.
i have a door seal at the bottom of my door..nothing gets in,nothing gets out!..if u are worried about smell then i would kick ur fan/filter on every hour for about 20 min or so to clean the air/smell of pot!.. any strain is gunna smell once it start to flower...even in vegg plants can have a strong pot smell!
Yes, the fan/filter will clean the air in the spare room also..as long as the vents in ur tent r open and sucking air into the tent!
Hope this helps guys..keep asking if it doesnt!