This my thinking as well. A sealed room that is stinking up the house isn't sealed. Negative pressure is critical. Doesn't have to be much. If I have everything set up right, I can eliminate odor from two grow rooms with a single filter (Phresh). I don't count on everything being and remaining perfect so always run at least two for insurance, but both are in the same room. Escaping smell for me has always meant I was somehow exhausting contaminated air.I think I know what the problem is now that I have a clear picture in my head of your grow room. You need negitive pressure all the time , smell will always get out of a sealed room through cracks, opening and closing doors ect. I've even had a place with a double entrance to try to "seal" the grow but it's just not possible. You have two options, create a lung room and vent your scrubbers into that or use a small 6" scrubber and fan to vent outside on an idle. or like others have said , ozone and vent outside.