(1) First of all, understand the air duct of the silent large fan power supply. The opening surface of the large fan sucks air, and the rear power supply interface side exhausts air. As shown in the following figure:
(2) The following figure shows the most mainstream chassis under power supply at present. The power supply itself can use an independent air duct. The lower wall of the chassis is hollowed out, and the opening of the large fan of the power supply faces downwards, so as to suck in cold air from below, and then discharge hot air from behind:
Let's take another side view, with the layout under power supply and the opening of the large fan facing downwards, so as to suck in cold air and discharge hot air from the rear of the chassis:
(3) The air duct is different from the above mainstream air duct. In short, remember one thing-build a smooth air duct (lower and forward cold air, upper and rear hot air), so that the heat inside the chassis can be discharged out of the chassis shell without hindrance, and do not form air ducts that are mutually antagonistic or seriously interfered.
the following figure shows the typical air duct of "tower chassis with power supply under it": forward and then out, downward and upward.