2. Whatever volume of air comes in someplace, an equal volume goes out someplace else. (compressibility as applied to gasses and pressure)
3. Blowing hot air out drags the hot air of the environment and the hot air emminating from the motor over the motor lowering the useful life of the fan
4. When you want to get cool do you point the fan on you or away from you? How about you hot car engine or attic fan?
5. If you face a box fan in a window out, as some propose, then it will suck some air into this room from other rooms in the house and they may still be warm too.
6. So it's better to face it inward. That way, you displace hot air somewhere and bring in a full volume of cool air in.
7. If you sit in the breeze of the fan, you'll benefit from the cooling effect due to both evaporation of sweat and the increased heat transfer coefficient due to force air flowing past you.
8. The only reason your computer power supply blows out is because the hot powersupply is closer to the exit then the cool air coming in cooling the processor near the front.
9. Premium computers have a minimum of two fans. 1 in, 1 out. Same as electrical enclosures with very expensive electronics.
10. Fans on sides of computers ALWAYS blow in.
11. The more window fans you have working, the better. Aim to set up an equal number of in- and out-blowing fans. If you have an odd number, configure the extra one to pull air in. -BobVilla.com
[src: various]
Ref. fans installed at the inlet to pressurize the enclosure slightly, help keep dust and dirt out (pdf)
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