Begabolia. Fan size is closely related to airflow, in that larger fans will push more air than smaller ones while running at the same RPM. E.G., a 120mm fan will have a 120mm x 120mm frame. That's the best I can think of -- if the 120mm case fans are 120mm across TOTAL, then if the holes are 5mm in on each side, it would make sense (its mounting holes would then be 110mm apart). Multiply this number by 2 and you have your blade span or fan size. Re: Fan size, how to measure… Measure the length of one blade from tip to base. Fan size is also limited, so this type of system will be louder. You measure one side of it. Alternatively referred to as a system fan, a case fan is located inside a computer, attached to the front or back of its case. Most three-pin boards run fans at their maximum rated speed. For example, a 13.3 inch screen is 33.8 centimeters (13.3 x 2.54 = 33.782). Specifically from the center of one hole to the other, on the same side. Logically, a three-pin CPU fan is designed to run at maximum … If the ceiling fan has an even number of blades (2,4), measure the distance from the tip of one blade to the tip of the blade on the opposite side to find the blade span. Top . If you’re not constricted by space, then I think that an ATX-based PC is the way to go. Step four, determine your fan's speed: Some motherboards only use a three-pin CPU fan connector (clearly labeled CPU fan), meaning it isn't fed Pulse-width modulation (PWM) commands, which modulate the fan's speed in relation to the temperature of the motherboard. This page really helped me to pick the right case fan for my computer. 120mm case fans tend to be the most popular size of fans in modern PC cases, but you will find many sizes such as 80mm, 92mm, 140mm, 200mm and beyond. Most of the time you’ll get a better VRM, better cooling, and you’ll always get more features. 120mm fans should be 120mm/12cm from edge to edge etc CPU: i7 8700k, 4.9ghz 1.29v llc1 Motherboard: Asus Z370-i G Ram: Trident-Z 3200mhz->3866 cl17,17,37 GPU: Strix Oc 1080ti 2075mhz Case: aNcase M1 Gerbil In Training. AIO coolers start off a bit higher than air, around $60 (£45), and can run well over $150 (some models in the UK cost over £200) depending on the brand, size, and features. As the saying goes, one should buy small ceiling fans for small rooms and large ceiling fans for large rooms. In your case it sounds like you overmeasured by going beyond the holes so the actual measure might be 65mm. Multiply the blade length by two and add that measurement to the hub diameter from step 3 to determine your total fan diameter. Posts: 5 Joined: Wed Feb 01, 2012 4:12 am. The screw holes measure 11 cm (110 mm) across. Fan Size. 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