You could design a scrubber setup in the room, as well as a filter on the exhaust vent and effectively remove all the smell.
Complete smell removal is possible if you design it right. That link has lots of advice in it, and good tutorials on how to do it cheaply.
I used to crop 180 plants every 2 months or so, and no one had a clue the room was there. I had guests over quite often and I was even so confident as to hold a few whopping parties at the house with out any one the wiser.
That being said, I do not recommend doing that.....lol. I spent a shit load of money on a killer carbon filter system with a whopping exhaust fan that kept the room on constant vacuum. Not a hint of smell ever came FROM that room, though inside it was nearly toxic with stink.