Bottom fan wont suck air

It doesn't matter. IBM and HP did a lot of research on this topic in the 60s and 70s. Winter persists, but Winter Bash has drawn to a close! Mike Bryant Mike Bryant 23 5 5 bronze badges. Ask Question. In general case, the effectiveness of such heat transfer mechanism depends on the speed of the air flow that 'takes' the hot molecules and throws them away, because, the more of hot molecules we can remove from the above of surface, the cooler it will be. The most important question.