does anyone know where i can buy a cheap hole saw bit for drilling 120mm fan ports???
homedepot. or lowes. or walmart. just get one that fits inside the hole of the fan and you probably will be good. DONT MAKE THE HOLES TO BIG.
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You might have a slight problem. 120mm = 12cm. 2.5cm = 1 inch 12/2.5 = 4.8inches. A 5 inch hole saw will be too big, a 4 inch would probably make a hole restrictive to air flow. Just something to consider.