F5F Stay Refreshed Power Users Overclocking Could running top fans as intake affect performance? It may have some drawbacks.

Could running top fans as intake affect performance? It may have some drawbacks.

Could running top fans as intake affect performance? It may have some drawbacks.

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sashabogus
Junior Member
5
04-06-2025, 12:22 AM
#1
I created a fully custom loop about two days ago using the provided settings, but I encountered a lot of negative air pressure even when I set the top fans to their slowest speed of 5-600 rpm. Although it was slightly better at that point, it remained negative. The case is a Phanteks P400S. I had to replace the exhaust fans with intake fans to achieve positive pressure; they are dust filtered, so I don’t need half my cat inside the case.
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sashabogus
04-06-2025, 12:22 AM #1

I created a fully custom loop about two days ago using the provided settings, but I encountered a lot of negative air pressure even when I set the top fans to their slowest speed of 5-600 rpm. Although it was slightly better at that point, it remained negative. The case is a Phanteks P400S. I had to replace the exhaust fans with intake fans to achieve positive pressure; they are dust filtered, so I don’t need half my cat inside the case.

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oleg123700
Member
55
04-06-2025, 12:22 AM
#2
From your picture, the upper fans seem to be drawing hot air from your case and pushing it out through the top, which is how they should function. Front and side fans are typically used for intake, while top and rear fans handle exhaust. This setup ensures proper air movement. The image was just a reference and shows my old fan configuration, which is almost identical except that the upper fans are now acting as intake. Understood. Remember my earlier note: "Usually, front and side fans are intake. Top and rear fans are exhaust. All about air flow." You shouldn't have too many intakes and insufficient exhaust to achieve balanced airflow for effective cooling. Feel free to try different setups and see what works best.
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oleg123700
04-06-2025, 12:22 AM #2

From your picture, the upper fans seem to be drawing hot air from your case and pushing it out through the top, which is how they should function. Front and side fans are typically used for intake, while top and rear fans handle exhaust. This setup ensures proper air movement. The image was just a reference and shows my old fan configuration, which is almost identical except that the upper fans are now acting as intake. Understood. Remember my earlier note: "Usually, front and side fans are intake. Top and rear fans are exhaust. All about air flow." You shouldn't have too many intakes and insufficient exhaust to achieve balanced airflow for effective cooling. Feel free to try different setups and see what works best.

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mcrafter5279
Member
128
04-06-2025, 12:22 AM
#3
Based on the image, the upper fans are removing hot air from the case and expelling it upward, which is their expected function. Front and side fans seem to be drawing in air, while the top and rear fans handle exhaust. The overall air movement looks correct.
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mcrafter5279
04-06-2025, 12:22 AM #3

Based on the image, the upper fans are removing hot air from the case and expelling it upward, which is their expected function. Front and side fans seem to be drawing in air, while the top and rear fans handle exhaust. The overall air movement looks correct.

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EricaKal
Junior Member
3
04-06-2025, 12:22 AM
#4
From your image, the upper fans are drawing in hot air from your case and pushing it out through the top, which is what they should do. They seem correctly installed exhaust fans. Typically, front and side fans handle intake, while top and rear fans manage exhaust. All about the air movement. The photo was just for reference and shows my previous fan arrangement, which is almost identical except now the upper fans are acting as intake.
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EricaKal
04-06-2025, 12:22 AM #4

From your image, the upper fans are drawing in hot air from your case and pushing it out through the top, which is what they should do. They seem correctly installed exhaust fans. Typically, front and side fans handle intake, while top and rear fans manage exhaust. All about the air movement. The photo was just for reference and shows my previous fan arrangement, which is almost identical except now the upper fans are acting as intake.

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Waddos
Member
157
04-06-2025, 12:22 AM
#5
From your image, the upper fans seem to be drawing hot air from your case and pushing it out through the top, which is correct. Front and side fans are typically used for intake, while top and rear fans handle exhaust. This setup ensures proper air movement. The picture was just a reference and matches my old fan configuration, with only the top fans now functioning as intake. As discussed before, "Front and side fans are intake. Top and rear fans are exhaust. All about air flow." You should aim for balanced airflow to get the best cooling performance. Don’t hesitate to try different configurations and see what works for you. Good luck!
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Waddos
04-06-2025, 12:22 AM #5

From your image, the upper fans seem to be drawing hot air from your case and pushing it out through the top, which is correct. Front and side fans are typically used for intake, while top and rear fans handle exhaust. This setup ensures proper air movement. The picture was just a reference and matches my old fan configuration, with only the top fans now functioning as intake. As discussed before, "Front and side fans are intake. Top and rear fans are exhaust. All about air flow." You should aim for balanced airflow to get the best cooling performance. Don’t hesitate to try different configurations and see what works for you. Good luck!