The front mesh bay cover provides cool air into the system while dust filters prevent dust from entering Up to 7 system fans are installed to expel hot air effectively from the case. Z9 Plus supports bottom PSU installation & provides an aperture for cable management to make better use of interior space. The interior of chassis is coated black to provide a sense of unity & elegant design. The server-type Tool-Free HDD Mount Trays allow easy HDD installation/removal & maintenance. The interior has been designed to be spacious for easy installation & maintenance of various components. Front I/O module enables the location of DVD-ROM & other components to be changed easily according to user preference. 2-Channel Fan controller for adjusting the system temperature & external LED temperature display are provided. By controlling noise & interior temperature with the fan speed, system can be operated at the most optimal condition. Side Acryl Tuning is provided for users to view the interior of gaming system. Front I/O module provides 4 USB (Universal Serial Bus) 2.0 ports for user convenience & expandability. Four 120mm fans deliver maximum cooling, & 3 Blue LED fan emphasizes cool aesthetics. For Z9, 1 front 120mm Blue LED & 1 rear 120mm White Impeller fan are provided. Dust filters in the front & bottom mesh covers prevent dust from entering the system & keep the internal components dust-free. Space is provided on the back of M/B plate for installing 2.5" HDD/SSD. Separate apertures for CPU cooler are provided for convenient CPU cooler installation without having to remove motherboard from case. 3IN1 Adapter Tray is provided for installing FDD / 3.5" HDD / 2.5" HDD/SSD. Tube apertures are provided at the rear of the case for convenient water cooling set-up & maintenance.