There are so many variables to answering your question completely. It is possible to fill the space with a fazer as long as you have the time, extra fluid, and the HVAC team on your side. In large rooms, arenas, theaters, they have large heating and air conditioning systems and when they turn on to circulate the air it moves pretty quickly and so will you fog/haze. Sometimes that can work in your favor if the vents are on the other side of the room they will actually help you distribute the haze around, but if the vent is above the stage or off to one side or the other it will pull the air that way. So if you hazer is on the left side of the stage and the vent is also, then your fazer will never fill the room. I would expect that your fazer will be running at full output to fill the room and then keep running at full to maintain it once the air kicks on. most fazers have a long heating and sequencing time meaning that they cant run constantly without taking a break either by you shutting them off or the heating element cycyling through heating times. Also I think that by the time your fog reaches the farthest point away from the fazer it will be quite thin compared to near it. I have been in the situation where I needed to fill a large room with an undersized hazer and i found that teh best way was to figure out the direction of airflow and move the hazer to the other side of the space to it pulled the haze across. If you only NEED to fazer the stage/performance area instead of the whole room I would keep it on the stage and add a fan or two. I am sure you will need to setup the fazer, run it, and then move it around accordingly. Allow of enough time for setup to experiment and if you have the option, bring more than one.