thermally advantaged design optional 92mm front and 120mm rear cooling fans pass intel 3.4+ghz cpu thermal test slot bracket with venting holes excellent emi solution optional emi liner for slot windows optional emi liner on chassis edges easy installation and maintenance fan holder for 120mm rear fan installation easy bezel removal design screwless slide rails for 5.25” and 3.5” devices optional screwless holder for add-on card installation safe assembly folded edge for each part membrane of side cover to avoid scratch configuration flexibility screw-mounted or rail-mounted for 5.25” and 3.5”devices optional extra 2-bay or 4-bay hdd cage maximum security support kensington lock, optional intrusion switch and keylock side cover latch usb2.0 fpio support optional usb2.0/audio or usb2.0/audio/ieee1394 fpio board