Computers collect dust. Lots of us have pets (I have a cat) that increase dander and dust levels. Even if you keep your room or apartment squeaky clean, dust will accumulate. It's a lot easier to pull out a filter and clean it than it is to try to blow compressed air inside a powersupply and clean it that way. The fact of the matter is that removable dust filters are becoming the standard on high end cases these days, and it's simply inexcusable for a top manufacturer like Coolermaster to not include them.
__________________  My Rig: Z77A-G45; 3570K; H80i; 2x4GB Kingston HyperX 1600Mhz; ASUS GTX660 SLI; 2x 128GB Crucial M4 SSD; 500GB WD Black; PC&C 750W PS; CM 690II Advanced;
Son's Rig: M5A97; 1055T; CNPS20LQ; 2x4GB Corsair Vengeance 1600Mhz; Sapphire HD5870; 80GB Intel 520 SSD; 320GB WD Black HDD; SPI 700W; Bitfenix Shinobi;
HTPC: F1A75-M PRO; A6 3670K; Hyper 212+; 2x4GB G.Skill Ripjaws 1866Mhz; ASUS GTX650Ti Boost; Corsair 60GB SSD; 1TB WD Green; 2x 2TB WD Green; SPI 450W;
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