Are the 120mm fan in the back, suppose to blow air in?

It is supposed to blow air out (exhaust) of the case. Cool air is taken in at the bottom/front and sometimes from the side. as the air is warmed by the hot components, it will want to rise and is removed by fan(s) in the back/top. With the top/rear fan blowing inward, it's trapping the warm air near the top of your case, preventing the effective cooling of your processor, memory and possibly some drives.

They are supposed to blow air out, away from the cpu, I'm not totally sure how to make it blow out air instead of in, but I THINK (NOTE THINK) that depending on which cable you plug it up to (it should've come with two different power cables) it switches it from in to outdackchaar

All you do to change the airflow is unscrew the four mounting screws for the fan, turn it around and reinstall the screws. Easy.

They are supposed to blow air out, away from the cpu, I'm not totally sure how to make it blow out air instead of in, but I THINK (NOTE THINK) that depending on which cable you plug it up to (it should've come with two different power cables) it switches it from in to outdackchaar

It's more simple than that. Remove the fan, reverse the side and reinstall the fan. And yes it's supposed to blow air outside of the case.

How about the blowhole (Up top)? If you decide to attach a fan at the blowhole, should it be blowing IN, or OUT? I have mine blowing in... so does that defeat the purpose of having the air pushed out through the blowhole? I'd like t o know so I can make the necessary changes. Air in the computer rises right? And the rest gets sucked out through the back? For best cooling, how many fans should we have and what sizes? Thanks in advance.Elann2008

The blow hole on top removes hot air from the case. It doesn't draw air into the case. It should work with the natural flow of the rising hot air. How many fans and their placement depends entirely on what kind of case you have and what hardware you've placed inside. Generally, if you have a fan mount on your case, place a fan in it. The largest size that will fit, with a high CFM rating...if you're designing an air-cooled system that is...

It is not supposed to do one or the other. Yes most people have intake in the front and exhaust in the rear. But if you wanted you could have rear intake, and front exhaust.

Just as long as the front and rear work together, you don't want them to both exhaust or intake.

[QUOTE="Elann2008"]How about the blowhole (Up top)? If you decide to attach a fan at the blowhole, should it be blowing IN, or OUT? I have mine blowing in... so does that defeat the purpose of having the air pushed out through the blowhole? I'd like t o know so I can make the necessary changes. Air in the computer rises right? And the rest gets sucked out through the back? For best cooling, how many fans should we have and what sizes? Thanks in advance.Sentinel672002

The blow hole on top removes hot air from the case. It doesn't draw air into the case. It should work with the natural flow of the rising hot air. How many fans and their placement depends entirely on what kind of case you have and what hardware you've placed inside. Generally, if you have a fan mount on your case, place a fan in it. The largest size that will fit, with a high CFM rating...if you're designing an air-cooled system that is...

Oh, I see... So I better take remove the fan from the blowhole.. and put it up front. I have another fan upfront but it's really low on RPM and CFM. I'm RMA'ing it back today. It's AeroCool and it's pretty crappy.

It is not supposed to do one or the other. Yes most people have intake in the front and exhaust in the rear. But if you wanted you could have rear intake, and front exhaust.

Just as long as the front and rear work together, you don't want them to both exhaust or intake.

ch5richards

Ah I see. I get it now.. And you also want air rising, correct? I see a lot of setups have two to three fans at the bottom of the case, blowing air up through the blowhole.

It is not supposed to do one or the other. Yes most people have intake in the front and exhaust in the rear. But if you wanted you could have rear intake, and front exhaust.

Just as long as the front and rear work together, you don't want them to both exhaust or intake.

ch5richards

Since most rear fan mounts are higher on the case than the front fan mounts, it's a little silly to try to reverse the air flow...as I said before hot air rises.

Ah I see. I get it now.. And you also want air rising, correct? I see a lot of setups have two to three fans at the bottom of the case, blowing air up through the blowhole.

Elann2008

All you have to do is turn the top fan around, so it's blowing the hot air out of the top of the case. When you get a chance, replace the cr4ppy front intake fan(s) with better ones...

[QUOTE="ch5richards"]

It is not supposed to do one or the other. Yes most people have intake in the front and exhaust in the rear. But if you wanted you could have rear intake, and front exhaust.

Just as long as the front and rear work together, you don't want them to both exhaust or intake.

Sentinel672002

Since most rear fan mounts are higher on the case than the front fan mounts, it's a little silly to try to reverse the air flow...as I said before hot air rises.

It is such a small height difference that is it negligible. You are talking about a few inches (or less) in most cases. The only problem I see with back to front is the PSU fan, but I don't see that being a big issue.

[QUOTE="Sentinel672002"][QUOTE="ch5richards"]

It is not supposed to do one or the other. Yes most people have intake in the front and exhaust in the rear. But if you wanted you could have rear intake, and front exhaust.

Just as long as the front and rear work together, you don't want them to both exhaust or intake.

ch5richards

Since most rear fan mounts are higher on the case than the front fan mounts, it's a little silly to try to reverse the air flow...as I said before hot air rises.

It is such a small height difference that is it negligible. You are talking about a few inches (or less) in most cases. The only problem I see with back to front is the PSU fan, but I don't see that being a big issue.

I suppose a person could design a case with low mounted intakes in the rear and high mounted exhausts in the front. But, then the drive bays would likely be repositioned in front of the rear intakes, to keep the hard drives cool. The optical drive(s) and memory would likely see temp increases, as air from the hard drives, CPU, northbridge and GPU were funneled toward the top front. That might be solved by a redesign of the ATX standard though. Reposition the memory sticks, where the PCI slots would be. On second thought. It might just be easier to turn the computer case upside down and facing backwards. :P

It is supposed to blow air out (exhaust) of the case. Cool air is taken in at the bottom/front and sometimes from the side. as the air is warmed by the hot components, it will want to rise and is removed by fan(s) in the back/top. With the top/rear fan blowing inward, it's trapping the warm air near the top of your case, preventing the effective cooling of your processor, memory and possibly some drives.

All you do to change the airflow is unscrew the four mounting screws for the fan, turn it around and reinstall the screws. Easy.

Sentinel672002

Sentinel sums it up

[QUOTE="Sentinel672002"]

It is supposed to blow air out (exhaust) of the case. Cool air is taken in at the bottom/front and sometimes from the side. as the air is warmed by the hot components, it will want to rise and is removed by fan(s) in the back/top. With the top/rear fan blowing inward, it's trapping the warm air near the top of your case, preventing the effective cooling of your processor, memory and possibly some drives.

All you do to change the airflow is unscrew the four mounting screws for the fan, turn it around and reinstall the screws. Easy.

Bullet_Holes

Sentinel sums it up

Would it be wise to attach a 120mm or 140mm fan at the blowholeat out the top? Would it be sucking the air from the inside of the case, releasing it out? Would that be effective or no?

I noticed my blowhole having drill holes for a fan. I'm sure a fan was meant to be there. That's why I ask.