The Zalman Z9 features front mesh cover for high cooling performance, black interior coating & front I/O module for easy component change. The front mesh bay cover provides cool air into the system while dust filters prevent dust from entering. The interior of chassis is coated black to provide a sense of unity & elegant design. Front I/O module enables the location of DVD-ROM & other components to be changed easily according to user preference. ** Front Mesh Cover for High Cooling Performance** The front mesh bay cover provides cool air into the system while dust filters prevent dust from entering. ** Supports up to 7 System Fans** Up to 7 system fans are installed to expel hot air effectively from the case. ** Supports Bottom PSU Installation & Aperture for Cable Management** Z9 Plus supports bottom PSU installation & provides an aperture for cable management to make better use of interior space. ** Black Interior Coating** The interior of chassis is coated black to provide a sense of unity & elegant design. ** Tool Free HDD Installation with Anti-Vibration Rubber** The server-type Tool-Free HDD Mount Trays allow easy HDD installation/removal & maintenance. ** Spacious Interior for Installing 290mm Card** The interior has been designed to be spacious for easy installation & maintenance of various components. ** Front I/O module for Easy Component Change** Front I/O module enables the location of DVD-ROM & other components to be changed easily according to user preference. ** Supports 4 USB (Universal Serial Bus) 2.0** Front I/O module provides 4 USB (Universal Serial Bus) 2.0 ports for user convenience & expandability. ** Supports Front & Rear 120mm Fan** Two 120mm fans deliver maximum cooling, & 1 Blue LED fan emphasizes cool aesthetics. One front 120mm Blue LED & 1 rear 120mm White Impeller fan are provided. ** Front & Bottom Dust Filters** Dust filters in the front & bottom mesh covers prevent dust from entering the system a