It really depends on the hot spot and where the vents are. Active systems are clearly always going to work, but a passive system if set up well can too. Not trying to suggest don't use a active system but a passive one is simple. I found that drawing it out helped me I marked the location of vents and hot spot and try to see where the air goes when it gets warm. Often the vents are all on one wall in mine above the hot spot and the warm air can only leave but there is little space for the cool to enter. The warm air leaves generating a slight low pressure it then draws in cool air than reverses. The low vents allow cool air to enter and the warm can exit and the whole system keeps neutral pressure.