![]() Common fan sizes used in computers Fan Cage Size (Entire Frame)Īlso, choose fans with a ball bearing instead of a sleeve bearing. You will be very happy you have done this later to enjoy a quiet system. Try to stick to the largest your case can support. So, I recommend a minimum of three intake fans to optimize airflow. If you have a larger full tower case, three intake fans at the front and one rear exhaust would be a good starting point for optimized airflow.Ī larger case has more areas where air can be pushed out than a smaller mid-tower. The computer case size will dictate how many you can install to a certain degree.įor most mid-tower cases, you will preferably want two or three fans on the intake on the front side of your PC and one exhaust. Some say that the intake side is always the top of the blade side, but I find this too generalized and not specific enough compared with the arrow markings on the fan itself. Take note of the small arrows stamped on its casing to see the rotation and airflow directions. Fan airflow directionįan airflow direction is determined by the direction that it is facing. Tip: Do not disconnect crucial fans for hardware components while your computer is running, like CPU or GPU fans for example. If one or more are noisy from a cold start-up but go quieter as they spin, be sure to replace it, as it will most likely give you problems later on. You will then be clear on which fans you need to replace. If you have any that are noisy, disconnect them one at a time until the noise is gone. Take note of how many intakes you have versus the number of exhaust fans. Take a look at the fans that you currently have on your PC. This leaves little chance for stagnant air hanging around to warm up and prevents the internal temperature from rising above desired levels. Having positive air pressure means that the air will be drawn primarily from your intake fan(s), and as I’ve mentioned, the air is easier to filter.Ī standard air filter can be installed in front of your intake fan(s) if your case doesn’t have one to ensure that cleaner and more dust-free air is drawn into your case.īecause the airflow is more balanced (but not equal air pressure), plenty of air is still exhausted, which means plenty is flowing in and out to help achieve optimal airflow. This is what I have found to be the best in terms of keeping things cool and clean. Slightly positive air pressure (More balanced) This results in stagnant air, which can get hot from the internal components and raise the PC’s internal temperature. If a lot of air is being forced into the case with little exhaust airflow, you can find yourself in a position where insufficient air movement occurs. While having some positive internal case air pressure is good, it is not the best if it’s too excessive. The intake fans have a higher airflow rate than the exhaust ones. Positive air pressure means more air is blown into the case than out. If these conditions are present, it can be argued that the case may remain clean for longer periods. The computer case cannot have too many unfiltered intake areas.The filter must have the correct cross-flow rate.The filter must have the correct pore size and density.There must be a large enough intake area that is filtered.However, in some unique instances, you could have a situation where a negative air pressure configuration won’t draw in much dust. This is because air may be drawn in where there is no place to add a filter. It is also more difficult to add filters to the intake areas of the case that specifically draw air in through them exclusively. While it is an effective way to cool your system, it can often result in more dust being pulled into your system over time. Side note: The same points listed here can be applied to any fan configuration when comparing airflow rates. The exhaust fans have a higher airflow rate specification than the intake ones.The exhaust fans spin faster and are the same size or larger than the intakes. ![]()
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