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1. Probably not.
2. Yes. One in front and one in back is usually plenty.
3. Yes. You use nuts and bolts, or self-threading screws that bite into the plastic fan holes. Some cases have fan cages that you snap the fans into with no screws.
4. They suck air from the bottom - there should be space between the plastic bezel and the metal frame. Some bezels have perforated holes in them.
5. The switch on the back removes all power from the system - ATX has power on the motherboard even when the system appears "off".
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