From an IT guy, yes, if the area has no ventilation the heat will kill the DVR. That said, it doesn't take a lot of air flow to keep them happy. I'm in the process of mounting a PC 5.25" bay fan (used for cooling a hard drive) into the side of a cabinet, powered with an AC adapter with a computer molex connector on one end. This particular cooler has some blue LED lighting and an adjustable fan controller so it needs both 12v and 5v. Don't forget you need a gap or hole somewhere else for the air you are blowing in to come out!