I’ve met novices at LAN parties who simply install fans blowing inward in every fan mount, and that might work to some extent. One person I know online claims to have 8 fans in his system. “How many are exhaust fans?” I asked him. “Blowing out? He answered. “I think the power supply fan blows outward.”
In fact, it’s just as important to vent heated air out of the case as it is to draw cool air in. Blowing air directly onto every component keeps the warmed air confined in the case, aside from what can escape through ambient holes. Instead, you should try to create a cross-breeze running through the case—just as you try to create in your house on a warm summer day by opening both the front and back windows.
Most fan mounts are on the front and the rear of the case chassis. Since the computer case, whether it’s on the floor or on your desk, faces you, you probably don’t want the warmed air venting through the front right toward you. Instead, envision a breeze blowing in through the front panel, sweeping through the computer, and escaping through the rear of the box—or you could just look at the diagram.
With the power supply being a rogue, it’s hard to create a perfect balance of air coming in and air venting out. Thus, you’ll end up with either a vacuum created in the case (if more air is leaving than coming in) or a buildup of air pressure (if more is coming in than going out). As long as intake and exhaust are both accounted for, don’t worry too much about it. The advantage of creating a vacuum is that more cool air will be drawn in through ambient holes and gaps, and it might cool the air temperature a bit, but dust will also get sucked in.
Continued…
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