Static Pressure vs Airflow

Petrolhead · 28 Nov 2018 at 12:13

I am sure you this question asked a lot

I understand that statistic pressure fans are used for items such as radiators and cpu coolers.

However what would you use for a case that has a grill to push through or a case with a filter to pull through?

doyll · 28 Nov 2018 at 12:34

Modern cases with filters easily have as much resistance to airflow as radiators and coolers, some have even more resistance. I always use fans with a pressure rating of 1.3-1.5mm H2O or more at 1300-1600rpm. I don't run case fans that fast, but they do run at about 1050-1150rpm with CPU and GPU at full load .. and it's nice to have some additional airflow in reserve for those really hot summer days when filters are dirty and I need to run some high load applications.

be quiet! Silent Wings 3 are very good but expensive.

Phanteks PH-F140MP and PH-F120MP are also very good and if on special can be bought in 2-pack and 3-pack for very reasonable prices.

New Arctic P series fans look like they will be very good and if quality control is good will be a good option for people on a tight budget. The Arctic F series has proven to be a good fan at very low prices, so Arctic P series with it's higher pressure ratings should be even better.

ttaskmaster · 28 Nov 2018 at 12:48

Petrolhead · 28 Nov 2018 at 13:12

Interesting.

There is still a lot I don't know about building PCs

The question came about after a discussion with a friend of mine and I was unable to answere his question. Specificall the exhaust fan on my case. With the fan in from of may face (not in tyhe case) I could feels a good flow of air but once installed in the case behind a grill I noticed how much it had dropped.

Looking at the photo of the two fans I assume the top one is a Static Pressure and the lower one Air Flow

doyll · 28 Nov 2018 at 18:44

Often the best case fans (higher static pressure rating) do not have high unrestricted airflow, but when compared to other fans as the restriction increases fans with lower static pressure rating have progressively lower airflow compared to high static pressure rated fans. The HardwareLUXX fan review linked below has airflow in m3/h for unrestriced, through wire grill, wire grill & SST-FF143 filter, Cryorig H5 cooler and NexXxoS ST30 140mm radiator respectively. We can see in the bar graphs how as airflow resistance increases the fans with higher static pressure rating maintain higher airflow rates than the lower pressure rated fans do. Please not that H5 cooler is more restictive than ST30 140mm radiator.
https://www.hardwareluxx.de/index.p...erspricht-hohen-statischen-druck.html?start=5