Very disappointed with it, when you initially activate the machine you get a massive blast of heavy smoke, (this is with using the QTX eco haze fluid) which would easily set off fire alarms, once it's been running a few seconds it's slows to a nice haze but by then it's too late and you have to shut off the machine. My old QTX HZ3 machine never did this, wouldn't recommend, you might as well buy a cheap smoke machine at a 1/4 of the cost.