After a few successful flouro grows (approx 7500 lumens total) I've decided that a 250W HPS for flowering will be the next stage. Though I planned to upgrade last grow I never got around to it. My biggest worry is ventalation. Most of the fans I've seen on sites that sell lights are insanely expensive, at least for me. I went around a few local hardware/home decorating stores and found some household fans that will fit the space but I'm concerned they won't be powerful enough. How powerful will a fan blowing from one side of the light to a duct on the other need to be? Will a standard household fan on high power be enough? for further clarification {fan} attached to one side of {light + reflector} and {duct} on the opposite side to vent the hot air.