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Originally Posted by pradeep_chauhan
By the way guys we come back to the same Q
DOES THE CPU FAN SUCK AIR ON THE TOP OR BLOW AIR OUT TO THE TOP?
Accoriding to me i think the fan sucks in air and blowes it over the heatsink. So all this talk about the chimney and its effects realy do not make sense. As the air is being sucked in and the hot air is comming out of the side of the heatsink so what good does having a funnel on top do? Does it allows cooler fresh out of the box air to be sucked in or provide a path for the warm air to escape? I think the answer is nighter its a hoax and serves no purpose. The best solution is to remove the thing and use the hole in the cabinet to attach a fan that sucks air into the box.
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CPU Fan sucks air. A chimney vent near it makes perfect sense. The low pressure area just above the CPU fan will cause fresh air to come in from the side chimney vent. Another fan in the chimney is not a necessity. I've covered the chimney with a mesh filter, which eventually collected dust. This is proof enough that there is positive air flow through the chimney.
With this arrangement - cool air comes in thru side chimney > cpu fan blows it over cpu heatsink > hot air from sides of the heatsink is sucked and thrown out by the case fan at rear.
parimal - The grab-it iBox has a chimney vent as mentioned in my previous post. Only, then I didn't know it was called a "chimney vent.