19 inches small box metal CCTV case Rack mount Chassis
Into the air volume is greater than the exhaust volume. This is the concept of positive pressure differential box proposed by Yin Xin. If the amount of air intake is less than the amount of exhaust, the chassis negative pressure, the dust will accumulate from the gap of a variety of boxes, because it is impossible for all the box have a dust-proof design gap, the accumulation of dust will enter the chassis. Common chassis design, if the power supply has an independent air duct, double into a can. But if there is no independent air duct power, but also from the chassis into the air exhaust, then it is double into the double. Taking into account the air intake fan has air filter, air intake will be reduced, so it can easily become the chassis negative pressure.
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