The PC-9F mid tower chassis has special safety features such as folded edges at strategic points to prevent sharp edges hurting users. The modularised parts can be removed, giving you more freedom to modify the case to suit your needs. The PC-9F supports six HDDs. Users can easily switch HDD?s as needed. The PC-9F is equipped with anti-vibration clips and grommets on the chassis, to absorb the noises created by vibrating and spinning parts. The EMI spring on the top cover absorbs the vibrations, without interfering with the side panel. The PC-9F has a 12cm on the rear of the case pulling hot air from the CPU region. In addition, the two intake fans, also 12cm bring in cold air through the HDD racks from the front of the case. This chassis also supports liquid cooling system, there are two holes for water tubes, and covered with rubber cover. The two USB 3.0, one e-SATA and HD+AC97 Audio ports are located at the top of the chassis. The PC-9F has three 5.25" drive bays (external), one 3.5" drive bays (external), six 3.5" drive bays (internal) and eight expansion slots. This chassis is compatible with standard ATX and micro ATX motherboards.