Air flow for positive pressure

[DanielCoffey]

I am doing a dry fit to plan a water-cooling build in a Nanoxia Deep Silence 6 case (front and top covers currently removed) and I am in need of opinions on the direction of the fans to maintain positive pressure in the case.

There are two filtered 140mm fans on the front, one unfiltered 140mm exhaust on the upper rear, two unfiltered 140mm fans on the roof, the PSU fan that is largely self-contained and also two 140mm fans on the side of the front radiator but inside the main case air space itself.

As it stands at the moment I expect negative pressure in the case with the floor filter being the main ingress for dusty air.

I don't think the front radiator fans will contribute much to the pressure as all they are doing is moving the air that is already inside the case itself. There is no ducting to connect them to the front intake.

I cannot fit the top fans on the outside of the case because the top cover gets in the way.

If I decide to keep the top fans as they are, I will be getting some shorter screws and swapping the top radiator round so it is in push configuration.

I understand that it is advisable to maintain positive pressure so I was considering reversing the two roof fans and pushing through the radiator into the case. That would give me four fans pushing into the case and one exhaust with the excess leaving via the floor and rear.

Every heat-generating component in the case will be water fooled - CPU, GPU and motherboard. There will not be any platter HDDs to worry about.

So... given the radiator anchor points in the picture, how would you arrange the fans in this case?

 

[OLDPHART]

Why do you want to blow hot air into the case interior > bottom front rad, all you are doing is heating the case interior up.

Can you not fit the front rad on the case floor and hot air flowing out via the bottom of the case floor .

Turn the rear fan round to pull cool air in.

 

[paulstung]

Looks good, but as mentioned buy a fan filter for the rear, and have it as an intake. positive pressure just means you need more fans blowing in than exhausting.

 

[GefGz]

To be honest with you, just as long as there aren't any "black spots" for circulation within the case, the difference between positive and negative air pressure is minimal at best, the biggest concern is controlling the dust if you're going for a positive case.

 

[DanielCoffey]

Thanks for the comments.

My current Mac Pro (which has no filters) is on blocks a couple of inches above a hard floor and I only have to do a thorough clean once a year so hopefully it won't be too much of an issue.