Negative or positive pressure? Does it matter?

[lexluthermiester]

I took a shot in the dark and bought this.
Very impressed how well it works, and I have way less dust getting on my PC
On sale it was $140. I can't believe I waited so long. I thought it would get hung up on stuff
but it doesn't. A couple of small changes I had to make but really happy with it.

I think you might have posted this in the wrong thread.

Noticed that Lenovo C30 does need to be closed, in order to function properly. Otherwise the CPU overheats, as no stream of air is coming through it.

Some OEMs engineer their cases like that.

 

[mtcn77]

I think you might have posted this in the wrong thread.

He made a joke while you on the other hand deny that positive pressure makes for a difference.
The irony being you both are in the same fence(dust in the environment) despite cannot agree on a single note is a good sense of humour to me.
Please don't take it the wrong way, I cannot take another y/n debate. Cheers.

 

[maxfly]

It looks like he meant to post in the "what have you bought today thread".

 

[mtcn77]

It looks like he meant to post in the "what have you bought today thread".

Yes, but both get dust out of the way which is what people in this post in the say no to positive pressure group is defending.

You don't have it both ways, either you are /n to positive pressure and argue against it saying filters are like useless RGB for cases and you can control dust from the outside with what - you guessed it, "a vacuum cleaner" - or, that positive pressure and filters can keep a case from collecting dust.

Not trying to stir up more heated debate. I just want to show my understanding of the current standings where I feel: you are more fractioned among yourselves, those that don't believe the utilities of "positive pressure".

It might as well be that you are more sophisticated and arguing for finer tastes, but I will hold my opinion that there is less fractioned opinion among us that support positive pressure without involving the merit of our argument.

May I ask whether you would concede to that, "yes to pressure" side of the debate is more unanimous in their decision? Because I don't see any counter arguments among ourselves that do agree to positive pressure. I'm not trying to confound this with statistical significance of its causation, but I see it as more statistical weight correlation since it looks like a more consciously given preference.

 

[skizzo]

I think someone could be looking at this with a bit of tunnel vision to believe that user posted in the wrong thread. They post about a product they purchased that cleans up dust which is what is being debated about how to keep it out of the PC.....well I'd say it could be argued, and well at that, that the best way to not get dust in the PC is to not have dust in the room/building the PC is in. so keep your spaces clean in other words as a good starting point. The connection is clear to me. So until we all can afford to build industrial level clean rooms for our PCs, we will have to resort to more obtainable methods lol

I have wood stove and stack at least 15 cords of wood in my basement every year. It is ABSOLUTELY FILTHY how much dust gets in the air due to this. I tend to get the best filters possible, so high MERV ratings, so when my furnace does run and circulate air around the house it doesn't deposit that into a room that needs to be kept much cleaner, like my computer room. That individual is taking the approach with a preemptive advantage by having one of those like roomba vacuums (or whatever they're called) run around. and that's not such a bad idea from my point of view. I've been known to take standing fans and box fans and take my furnace filters and attach them to those fans and let them rip down in the basement. yet another way to filter out all that dust. a bit ghetto or redneck engineering, but that's how I roll

as for negative or positive....I've always made intake slighter higher RPM than exhaust, should the system have the adjustment capability, so positive pressure

 

[lexluthermiester]

I think someone could be looking at this with a bit of tunnel vision to believe that user posted in the wrong thread. They post about a product they purchased that cleans up dust which is what is being debated about how to keep it out of the PC.....well I'd say it could be argued, and well at that, that the best way to not get dust in the PC is to not have dust in the room/building the PC is in. so keep your spaces clean in other words as a good starting point. The connection is clear to me. So until we all can afford to build industrial level clean rooms for our PCs, we will have to resort to more obtainable methods lol

I have wood stove and stack at least 15 cords of wood in my basement every year. It is ABSOLUTELY FILTHY how much dust gets in the air due to this. I tend to get the best filters possible, so high MERV ratings, so when my furnace does run and circulate air around the house it doesn't deposit that into a room that needs to be kept much cleaner, like my computer room. That individual is taking the approach with a preemptive advantage by having one of those like roomba vacuums (or whatever they're called) run around. and that's not such a bad idea from my point of view. I've been known to take standing fans and box fans and take my furnace filters and attach them to those fans and let them rip down in the basement. yet another way to filter out all that dust. a bit ghetto or redneck engineering, but that's how I roll

as for negative or positive....I've always made intake slighter higher RPM than exhaust, should the system have the adjustment capability, so positive pressure

Except that Jetster wasn't talking about the subject of this thread at all in his post. He was talking about his latest purchase. I think YOU are grasping at straws with your very flawed assumption above.

 

[Jetster]

I posted it here because of the reference of dust in room related to the subject of the thread. I have dust because I have a cat. I use positive pressure to keep the dust out of the case.
I thought maybe a robot vacuum might help keep the dust down, and was surprised it does so well. So I thought I would post it in this thread. Just thinking outside the box.

I think you all overthink stuff and you're off topic

 

[lexluthermiester]

I posted it here because of the reference of dust in room related to the subject of the thread. I have dust because I have a cat. I use positive pressure to keep the dust out of the case.
I thought maybe a robot vacuum might help keep the dust down, and was surprised it does so well. So I thought I would post it in this thread. Just thinking outside the box.

I think you all overthink stuff and you're off topic

Fair enough, shutting up..

 

[mtcn77]

Fair enough, shutting up..

Don't be. I think this debate is a fresh perspective on forum discussions as far as forum discussions go.
I have never been in a finer discussion with mutual understanding in all involved individuals. Usually it is an all flaming contest without tolerance or reservations, so it is good seeing it going like a class action so far.

 

[Jetster]

But seriously I'm excited about this thing. It finds dust I didn't know I had

 

[Mussels]

But seriously I'm excited about this thing. It finds dust I didn't know I had

I got myself an LG A9T, it wont move on its own but its sure good at vacuuming all the dust out of my PC's

The gaming PC with the side and front panels off out of laziness, gathered far, far less dust than the negative pressure server... that poor thing just gets choked every week. i need faster intake fans, or slower exhausts...

 

[maxfly]

Sorry Jetster, i assumed vacuuming ones home was taken for granted! Just teasin ya ;P
But since we're on the subject, I've got a pair(one upstairs, one down)of those uber powerful, fancy, self filtering vacuums that are great for keeping the dust down in our 100yo home. I still run an air purifier in my office 24/7 with excellent results. I may have to clean the filters in my rigs every 3-4 months. I also keep the door closed and forbid any of our hairy family members access unless I'm in there with them.

Positive, negative...like most pc related debates, i honestly dont care enough one way or the other what people choose to do with their rigs to keep them cool and dust free. It just isn't a big deal no matter how you slice it. If your way works for you...
JUST
DO
YOU
My contribution to the debate? I generally go positive with high static pressure inlets and high cfm out but it depends on the case im using for the specific build. The exception is my main water-cooled rig. I run high static pressure fans on all my rads and the rear exhaust with varied curves for each.
I usually follow the age old mantra of bottom, front and side inlets, top and back outlets but again it depends. Being that there are so many different cases and configurations, not to mention client requests. One rig may be positive while the next may not.

 

[Totally]

Here's mine, not sure if it's positive or negative. apart from the psu, fans are are you see.

My flow is setrup similar and I just realized it's absolutely terrible a couple weeks ago. Warm air is feeding into the top radiator. Haven't had time to really deal with it but did a quick and dirty test by taking the side panel off and saw idle loop temps drop by 5-7c. I thinking of making the top rad into an intake with a single rear actively exhausting.

That is where the speed comes in; slow air cannot carry as much dust as fast.

False, slow air carries just as much dust as fast air. Dust just settles quicker in slow air than it does in fast moving air.

 

[Deleted member 24505]

My flow is setrup similar and I just realized it's absolutely terrible a couple weeks ago. Warm air is feeding into the top radiator. Haven't had time to really deal with it but did a quick and dirty test by taking the side panel off and saw idle loop temps drop by 5-7c. I thinking of making the top rad into an intake with a single rear actively exhausting.

Mine is flat, the radiators in the pic are 240 left and 280 right, with the 2x140mm fans at the front. rads are in and 2x140mm are out, the window is the top of the case

 

[mtcn77]

False, slow air carries just as much dust as fast air. Dust just settles quicker in slow air

Hi, I want to disagree. Hot and cold air has different carrying capacities, just as hot water fizzles out dissolved gases faster. The question is withholding a change in dust precipitation by maintaining stable air speed and temperature within the case. I know how ostentious that sounds, since air heats up by its cooling action. The question is keeping it steady by reserving "overstock airflow capacity". The same as water coolers, you know: we can downsize our loop until the heat carrier fluid hits its peak temperature, yet it won't perform its best there. It is like maintaining supersonic flight without afterburners, or keeping laminar flow and not turbulent by heating air too much and introducing too much turbulence a.k.a. reynolds number. Trying to achieve bose einstein condensate like 'viscous' frictionless capillary action out of "random air particles" takes attention to detail like absolute zero superconduction does.

 

[freeagent]

I am down to 2 intakes, 1 exhaust.., 1 CPU fan.. still positive pressure

I did have 5 in 2 out at one point in this case.. a bit overkill.. Still have about 320CFM in and about 110 out.., and about 130 on the cooler.

Its quiet.. until its not.. I would say its fairly effective..

 

[Totally]

Hi, I want to disagree. Hot and cold air has different carrying capacities, just as hot water fizzles out dissolved gases faster. The question is withholding a change in dust precipitation by maintaining stable air speed and temperature within the case. I know how ostentious that sounds, since air heats up by its cooling action. The question is keeping it steady by reserving "overstock airflow capacity". The same as water coolers, you know: we can downsize our loop until the heat carrier fluid hits its peak temperature, yet it won't perform its best there. It is like maintaining supersonic flight without afterburners, or keeping laminar flow and not turbulent by heating air too much and introducing too much turbulence a.k.a. reynolds number. Trying to achieve bose einstein condensate like 'viscous' frictionless capillary action out of "random air particles" takes attention to detail like absolute zero superconduction does.

How are you disagreeing with me exactly? Air Temp isn't air speed and unlike air temp the speed at which air moves does not affect it's density. So you just said a whole lot of nothing for no reason.

 

[mtcn77]

the speed at which air moves does not affect it's density.

What makes you so sure this isn't how planes fly?

 

[Deleted member 24505]

What makes you so sure this isn't how planes fly?

The way planes fly is to do with pressure, higher below pushes wing up/or is it lower above sucks it up. I suppose that is related to density, more speed means more pressure.

 

[mtcn77]

more speed means more pressure.

Not unless you live in Australia, or something...

 

[Totally]

What makes you so sure this isn't how planes fly?

A phenomenon called lift that results due to a difference in pressure, nothing/much to due with air saturation/capacity.

 

[eidairaman1]

Don't use a filter on your top exhaust vents, then you will not need to worry about cleaning it and you won't have any air flow resistance out the top..


Wait, did I miss something? I'm not seeing any hostilities going on.
Nevermind, had to click "show ignored content"..


That glass panel can't be removed? Odd design..

Filters on exhaust make no sense

 

[mtcn77]

A phenomenon called lift that results due to a difference in pressure, nothing/much to due with air saturation/capacity.

Lift is not a discrete phenomenon since you haven't heard of bernoulli and the paper that lifted when blown over. Sweet.

Some people have really coined the phrase 'post-truth'.

 

[95Viper]

Let's stay on topic, please.
And, keep F.U.D. to a minimum.
Also, if you think there is a problem... report it and do not contribute to it.

 

[FireFox]

Filters on exhaust make no sense

If doesn't makes sense if you don't own a Corsair 1000D, if you do then things are different.