Aegis Posted January 26, 2006 Share Posted January 26, 2006 How do I know if my fan is blowing out the exhaust air or blowing in fresh, cold air? And which way is better for a case fan? Link to comment Share on other sites More sharing options...
ripken204 Posted January 26, 2006 Share Posted January 26, 2006 well one way is to just feel, and the other is do you see how 1 side of the fan has a plastic bar across it and the other side doesnt? it will blow the air out of the side with the plastic.you want air coming in from the front and going out the back Link to comment Share on other sites More sharing options...
Aegis Posted January 26, 2006 Author Share Posted January 26, 2006 Is it the same if the air is coming in from the back and blowing out from the front? Also what if the fan blowing out pushes less air out (~20CFM) than the fan blowing in (~80-100CFM)? Link to comment Share on other sites More sharing options...
Vitalix Posted January 26, 2006 Share Posted January 26, 2006 Generally the bulk of the heat is from the CPU, so you want that last in your ventilation trail. If you intake from the rear, you will blow the warm air from the CPU throughout the motherboard.Generally, you want the same pressure in and out. The warm air will swirl in the top of the case if not.Also, the HD is usually right in front, so the case fan actually cools the HD(s) pretty good. Link to comment Share on other sites More sharing options...
ripken204 Posted January 26, 2006 Share Posted January 26, 2006 cases are made to blow from front to back, so do it that way. you should think about upgrading fans, you need more cfm or else you wont be blowing much air out. or switch around the fans in ur case. Link to comment Share on other sites More sharing options...
puntoMX Posted January 26, 2006 Share Posted January 26, 2006 well one way is to just feel, and the other is do you see how 1 side of the fan has a plastic bar across it and the other side doesnt? it will blow the air out of the side with the plastic.There is one more; almost every fan has arrows on them, one for the “propeller” (rotor) direction and one for the air direction . Link to comment Share on other sites More sharing options...
LLXX Posted January 26, 2006 Share Posted January 26, 2006 Is it the same if the air is coming in from the back and blowing out from the front? Also what if the fan blowing out pushes less air out (~20CFM) than the fan blowing in (~80-100CFM)?Reversing the air flow isn't good, since the PSU fans always blow outward from the rear. If the air is made to enter from the rear, it'll just exit again out the PSU and "short-circuit" the circulation.If the output fan blows less than the input, the case will be pressurised. Link to comment Share on other sites More sharing options...
Aegis Posted January 28, 2006 Author Share Posted January 28, 2006 Is it bad if the case is pressurized? Link to comment Share on other sites More sharing options...
spazmire11 Posted January 28, 2006 Share Posted January 28, 2006 no its not bad, personaly preferance:negative pressure, more cfms outward:+ air will come in though the cracks and ventelate not so ventalated things- fan efficency decreased- dust builduppositive pressure, more cfms inward:+ air will blow out of the case thus helping the dust problem- hard to setupeven pressure, eaqual cfms:+least stress on fans+/- belived to be the most efficent Link to comment Share on other sites More sharing options...
Aegis Posted January 28, 2006 Author Share Posted January 28, 2006 Would having no exhaust fan work? That's how my 3-year old computer is like and it's running just fine. Link to comment Share on other sites More sharing options...
ripken204 Posted January 28, 2006 Share Posted January 28, 2006 you need one. thats just it, a computer from 3 years ago wont run as hot as computers now. is there a computer store nearby where u can just buy a fan from? it may not be a good fan but then you will be able to start using ur comp and then u can order a good one later on. Link to comment Share on other sites More sharing options...
spazmire11 Posted January 28, 2006 Share Posted January 28, 2006 while you CAN run withought a exaust fan it is NOT recomended the preformance increase is so great that it is basicly a necasity today, if the psu has a fan that draws air from the bottem, and a 120mm one at that. then you should be fine if your using a other then stock cooler. Link to comment Share on other sites More sharing options...
Aegis Posted January 28, 2006 Author Share Posted January 28, 2006 I've made up my mind to get another fan . Should I get the same one? Or does it only need a similar CFM? Link to comment Share on other sites More sharing options...
spazmire11 Posted January 28, 2006 Share Posted January 28, 2006 simaler cfms is fine, just as long as its not horrably diffrent, 90cfm + 30cfmmore like 50+40cf will be just fine. Link to comment Share on other sites More sharing options...
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