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Positive pressure foibles

post #1 of 17
Thread Starter 
Been reading ehume's entries on the subject, as well as demciflex's excellent thread on this : http://www.demcifilter.com/filters_performance.php#tips_&_warnings.

and i'm still not sure i understand the concept. headscratch.gif
how exactly do you determine if there is positive pressure on your system? more intake CFM than exhaust? only one way/direction for hot air to go out? reason i'm asking is because i'm seeing very different setups claiming positive pressure, so i'm confused about the rules of the game here..
would appreciate some help smile.gif

and on a more personal note - how would you recommend to go about creating positive pressure on my system (without cutting anything!!!! no cutting of my gorgeous case kungfu.gif), considering i have these:
1. 200mm front intake fan (stock)
2. 200mm top exhaust fan (stock)
3. 2 120mm rear exhaust GT-15s p/p on H60
4. 4 120mm side intake TB Silences on sidepanel

I have also removed one of the HDD cages, and will prob move the other one to the 3.5 bay if possible, to make airflow from fron 200mm unrestricted.
post #2 of 17
When there is air moving out of holes that don't fans exhausting there. My FT02 for instance has an air intake/exhaust on the back that doesn't need/have any fans (it's for the PSU to get some airflow). And I can feel air exiting out of it, while there are no fans on it.
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post #3 of 17
Ok, positive pressure is more intake CFM than exhaust.
The idea is that you can filter all your intakes, and excess air leaks out all over the place, not allowing dust inside. Plus air will be pushed into the GPUs to be exhausted through that path too.
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post #4 of 17
Thread Starter 
Quote:
Originally Posted by allikat;15380200 
Ok, positive pressure is more intake CFM than exhaust.
The idea is that you can filter all your intakes, and excess air leaks out all over the place, not allowing dust inside. Plus air will be pushed into the GPUs to be exhausted through that path too.

ok.. so it's just making sure all the intakes are filtered and that exhaust is as unrestricted as possible? how would i go about it in my case? all the intakes are already filtered (except for the sidepanel, and i'm getting filters for that), so should i remove the p/p from the rear and make it top intake p/p maybe?
post #5 of 17
Thread Starter 
Quote:
Originally Posted by MasterFire;15380181 
When there is air moving out of holes that don't fans exhausting there. My FT02 for instance has an air intake/exhaust on the back that doesn't need/have any fans (it's for the PSU to get some airflow). And I can feel air exiting out of it, while there are no fans on it.

thx man.. same question as my above reply to allikat smile.gif
post #6 of 17
That depends, if I am correct your 600T has one 200mm fan in the front that intakes air through a dust filter. Then one 200mm on the top that exhausts air, and another 120mm in the back that exhausts. Typically that means there's a negative pressure inside the case, causing the exhaust fans to draw in air through open holes that may or may not be dust filtered.

Chances are it'll be sucking in the extra air it's wanting to exhaust through the bottom from under/closeby the PSU. If all you're looking for is no dust in your case I suppose you could devise something with an old pantyhose or something. But it's not going to guarantee that it won't still suck in some dust from other small openings of the case.

You could turn around the top 200mm fan to intake from the top and devise a way to install a dust filter there, but that's not only something that will require time and effort, I'm not guaranteeing it'll cool better or even as good as it would before.


I think your best chance is leaving it as is, and just getting some cans of compressed air (or like me, before I had this case, drag the computer downstairs and hose it off with the air compressor).
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post #7 of 17
Thread Starter 
Quote:
Originally Posted by MasterFire;15391840 
That depends, if I am correct your 600T has one 200mm fan in the front that intakes air through a dust filter. Then one 200mm on the top that exhausts air, and another 120mm in the back that exhausts. Typically that means there's a negative pressure inside the case, causing the exhaust fans to draw in air through open holes that may or may not be dust filtered.

Chances are it'll be sucking in the extra air it's wanting to exhaust through the bottom from under/closeby the PSU. If all you're looking for is no dust in your case I suppose you could devise something with an old pantyhose or something. But it's not going to guarantee that it won't still suck in some dust from other small openings of the case.

You could turn around the top 200mm fan to intake from the top and devise a way to install a dust filter there, but that's not only something that will require time and effort, I'm not guaranteeing it'll cool better or even as good as it would before.


I think your best chance is leaving it as is, and just getting some cans of compressed air (or like me, before I had this case, drag the computer downstairs and hose it off with the air compressor).

actually the top 200mm has a removable filter as well, so i don't have to do anything other than flip the top 200mm to intake to do what you say.
however, since i'm also putting on the side-panel with 4 120mm's as intake as well, that would leave only the rear exhaust (2 GT-15s with the H60 rad) as the exhaust. i'm not sure that's enough of an exhaust for 2 200mm+4 120mm intake. am i right?

i could remove the p/p from the exhaust to make it a clear vent, but not sure i could fit the p/p on the top with the 200mm (the only place i can think of to put the p/p instead)..

i could also leave the top fan as the only exhaust, with the 2 GT-15s intaking. the top 200mm also doesn't "cover" all of the top vent, so there would be more space for the air to leave from. would that work for positive pressure (provided i filter the rear 120mm of course)?

i could also flip that and make it all-intake, but i'm guessing this isn't a good idea since air won't have anywhere to exhaust.

that's a lot of 'i could' headscratch.gif
post #8 of 17
make your front 200mm intake as well as your side panel. make your top 200mm exhaust and your rear p/p exhaust as well. assuming your front and top 200mm fans have the same cfm and run at the same speeds, your side panel will be providing more air than your rear can exhaust, hence making it positive air pressure and you will be fine
   
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post #9 of 17
Quote:
Originally Posted by templar;15391918 
actually the top 200mm has a removable filter as well, so i don't have to do anything other than flip the top 200mm to intake to do what you say.
however, since i'm also putting on the side-panel with 4 120mm's as intake as well, that would leave only the rear exhaust (2 GT-15s with the H60 rad) as the exhaust. i'm not sure that's enough of an exhaust for 2 200mm+4 120mm intake. am i right?

i could remove the p/p from the exhaust to make it a clear vent, but not sure i could fit the p/p on the top with the 200mm (the only place i can think of to put the p/p instead)..

i could also leave the top fan as the only exhaust, with the 2 GT-15s intaking. the top 200mm also doesn't "cover" all of the top vent, so there would be more space for the air to leave from. would that work for positive pressure (provided i filter the rear 120mm of course)?

i could also flip that and make it all-intake, but i'm guessing this isn't a good idea since air won't have anywhere to exhaust.

that's a lot of 'i could' headscratch.gif
Quote:
Originally Posted by chinesethunda;15392603 
make your front 200mm intake as well as your side panel. make your top 200mm exhaust and your rear p/p exhaust as well. assuming your front and top 200mm fans have the same cfm and run at the same speeds, your side panel will be providing more air than your rear can exhaust, hence making it positive air pressure and you will be fine

^This^

Assuming you have dustfilters for the side. If not, at least remove the top air filter so you won't have it catch dust on the inside of the case.
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post #10 of 17
Thread Starter 
Quote:
Originally Posted by MasterFire;15392968 
^This^

Assuming you have dustfilters for the side. If not, at least remove the top air filter so you won't have it catch dust on the inside of the case.

great, thx!!
yes the 2 200mm's are the same fans.

am getting filters for the sidepanel. will log temps before and after and post back, prob with some pictures too biggrin.gif
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