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post #21 of 30
Quote:
Originally Posted by DVIELIS View Post

Actually having more exhaust fans than intake has a vacuum cleaner effect, so that's why more intake fans than exhaust fans are preferred wink.gif Just a quick tip smile.gif
Sounds like a flat earth theory to me. rolleyes.gif

The one and only reason for more potential fan intake flow than exhaust flow is based on the use of filters on intakes,the fact that case airflow is the same both in & out, and that the airflow equalizes by pushing filtered air out unsealed holes / vents in case rather than pulling unfiltered / dusty air in them. thumb.gif

For kennyparker1337 the best solutions I can think of is to use half of window as intake duct into case intakes and case exhaust ducted into other half of window exhausting heated air. I would advise the intake duct to draw air from below window and exhaust duct to exit up. to keep heated exhaust air away from intake air.
Edited by doyll - 9/22/15 at 2:38am
post #22 of 30
Quote:
Originally Posted by doyll View Post

For kennyparker1337 the best solutions I can think of is to use half of window as intake duct into case intakes and case exhaust ducted into other half of window exhausting heated air. I would advise the intake duct to draw air from below window and exhaust duct to exit up. to keep heated exhaust air away from intake air.
I like that idea quite a bit but I think you could get away with just an exhaust if the room stays cool. Using some air ducting you could seal it up tight on the top back fan in the HAF 932. If you have a reference card with a blower fan you might have to use a large plastic bag sealed around the back of the case feeding into the tube then to the window fan which is in turn sealed with another bag around the edges.


Not a model of efficiency with all the restricted flow but it would work.
Edited by compy532 - 9/23/15 at 12:28am
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post #23 of 30
Exhaust it out of the window, so cold air comes into the room from around and under the door.

In my house, I have central A/C and vents over the doors that lead to the hallway.

I installed fans blowing the hot air out into the hallway ceiling thru the over-door vent. Cold air comes in from the A/C vent when it's on and from under the door when it's not on because the exhaust fan is running.

Even then, when stress testing my CPU, I NEED to open the door a little.
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post #24 of 30
You basically need to 'push' the stale air in the room out w/ fresh air from outside.

Centrifugal fans are far better at creating pressure than traditional box fans. I'd recommend using a lil air mover from harbor freight when you can find a 20% off coupon. They look like mini carpet dryers, and they move a lot of air. If needed, could duct the intakes on the fan into the window, preferably a blocked off portion w/ holes for the ducts. An open space would be left either open air, or with a traditional box fan exhausting, since the blower is building pressure in the room, the exhaust only needs to help it along. I've played around with ideas using PC fans, window fans, box fans, blowers, etc. I've almost always had the same problem as you.

Only now in my 1st apt, there's enough open air where my desk is that it doesn't matter much, and there's a window right by my desk w/ 2x20" box fans stacked atop eachother. I don't have the problem anymore biggrin.gif
post #25 of 30

Hey kennyparker1337, I have a quick question for you just to get a better idea of how much freedom you have to do things here to improve your comfort: are you living on your own in an apartment or in a house, or are you living with your parents?

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post #26 of 30
Best is to exhaust, It will create a negative pressure or vacuum in the area and force other air from other areas to enter. It also forces at least some of the air outside for insured air exchange. Except when it's below 60 degrees or so cold outside. Then you'll want incoming air with the fan with equal output air somewhere else.

Now... that said, you also should create a barrier between the fan, and the rest of the window so that they are at least 1 foot apart as fly the air.... so another way to put it would be. Put a cardboard piece or something of-the-like separating the open area of the window from the fan like a tongue sticking out the center of the window. This will reduce the air from cycling right next to the window where the pressure difference will be the highest. Also if you have a duct vent in your room, make sure it is open, and it's not right under the window. You can try to seal the window around the fan and force the air coming through the vents. But there is a higher static pressure in your vents; that can cause low airflow depending on the cfm of your fan, if it has metal blades etc.

To put this all simply. The further away your return (hot)air is to your supply (cold)air, the quicker the air will exchange. Also, you can try some methods of evaporative cooling. There is a bunch of different things people have thought about on youtube. i also have ideas, but never made a video.. lol.


Also in my experience, You want little to no static pressure in your case. The more your cfm difference is between incoming and outgoing air will increase your static pressure. Having a slight vacuum into your case insures you don't have any positive pressure. Positive pressure means you will have slight stagnant air that is accumulating heat before he exhausts. You will get a bit more dust wanting to come into your case if your negative pressure gets too high, so more cleaning. But, you'll have better airflow overall. If you really don't want dust; A little positive pressure in your case isn't bad unless your temps start to get to high. This information is based on work I've done in legit clean rooms. But in a clean room you can't have positive pressure, but they also use HEPA filters.

I just came across this and thought I'd comment. Hope this helps, Good luck!
post #27 of 30
Quote:
Originally Posted by doyll View Post

Sounds like a flat earth theory to me. rolleyes.gif

It is basic case airflow management actually wink.gif
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post #28 of 30
Quote:
Originally Posted by doyll View Post

Sounds like a flat earth theory to me. rolleyes.gif

The one and only reason for more potential fan intake flow than exhaust flow is based on the use of filters on intakes,the fact that case airflow is the same both in & out, and that the airflow equalizes by pushing filtered air out unsealed holes / vents in case rather than pulling unfiltered / dusty air in them. thumb.gif

For kennyparker1337 the best solutions I can think of is to use half of window as intake duct into case intakes and case exhaust ducted into other half of window exhausting heated air. I would advise the intake duct to draw air from below window and exhaust duct to exit up. to keep heated exhaust air away from intake air.

You want your PC case to have positive pressure. So it is not sucking in dust from little crevasses in the case.
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post #29 of 30
Quote:
Originally Posted by DVIELIS View Post

It is basic case airflow management actually wink.gif
No, your "vacuum" statement is flat earth logic and is not applicable to case airflow management. Have you ever tried to "vacuum" your house with your PC? tongue.gif
I was joking with the flat earth statement.
Quote:
Originally Posted by DzillaXx View Post

You want your PC case to have positive pressure. So it is not sucking in dust from little crevasses in the case.
Isn't that what
"The one and only reason for more potential fan intake flow than exhaust flow is based on the use of filters on intakes,the fact that case airflow is the same both in & out, and that the airflow equalizes by pushing filtered air out unsealed holes / vents in case rather than pulling unfiltered / dusty air in them."
says with a little more detail? tongue.gif
post #30 of 30
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Hey kennyparker1337, I have a quick question for you just to get a better idea of how much freedom you have to do things here to improve your comfort: are you living on your own in an apartment or in a house, or are you living with your parents?

Living with family. Not for long, though.
My own place will have A/C and/or not require it due to different weather.
I hate my current place's weather.
We skip winter and have an extra long summer / spring.
Most days it's 80F+ with a 80%+ humidity.
It will literally rain for 5 minutes and stop during a scorched day to ramp the humidity up to steam room temps.
I tried the A/C that we have but it jacked the electric bill up 250% or something insane.
Edited by kennyparker1337 - 9/25/15 at 12:23pm
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