My all time favorite CPU case Cooler master CM 690 II is now 3 months old. I really like this case since it makes me to keep the system very cool and healthy. Yesterday I opened the case to take a look inside and I noticed that there was full of dust over the fan and also inside the chassis. After one hour of struggle, I finally cleaned dust. Now it is spotless. But I don’t know how much longer it will be. So I am thinking about to add DEMCiflex filter. I don’t know whether these filter kits are worthy for $50 bucks. Is it a good choice? Will it going to restrict the Air?
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