The front mesh bay cover provides cool air into the system while dust filters prevent dust from entering. Zalman Z11 Supports up to 7 System Fans Up to seven system fans can be installed to expel hot air effectively from the case. One front, one rear, two top, two side & one bottom. Please see the specifications table below for sizes & supplied fans. Zalman Z11 Powerful HDD Cooling Solution Interactive Cooling System: The hot air generated from the HDD is expelled through both sides. Cooling Performance is maximised for HDD cooling, & the overall PC air exhaust is increased. Zalman Z11 Top Air Vent Exhaust For user convenience top air vents exhaust hot air thanks to the supplied cooling fan. In addition the vents have a transparent look increase the distinctiveness of the case. Zalman Z11 Side Acrylic Panel A dynamic side acrylic panel is provided for users to view the interior of the PC chassis. Zalman Z11 USB (Universal Serial Bus) Ports The Z11 Plus supports 2x USB3.0 & 2x USB2.0 ports Zalman Z11 Dust Filters for Front, Bottom & PSU Dust filters in the front, bottom & PSU opening have mesh covers that prevent dust from entering the system aiding in keeping the internal components dust-free. Zalman Z11 Supports Bottom PSU Installation & Cut-out for Cable Management Z11 supports bottom PSU installation & provides an cut-out for cable management to make better use of interior space; giving a tidier look inside the PC. Zalman Z11 Black Interior Coating The interior of chassis is coated black to provide a sense of unity & elegant design. Zalman Z11 Tool Free HDD Installation with Anti-Vibration Rubber The server-type Tool-Free HDD mount trays allow easy HDD installation/removal & maintenance. Zalman Z11 Spacious Interior for 290mm Card Installation The interior has been designed to be spacious for easy installation & maintenance of various components, including long graphics cards. Zalman Z11 Supports Solid-State Drive (SSD) Space is provided on the back of motherboard plate for installing a 2.5" HDD/SSD. Bracket also supplied for a 5.25" bay. Zalman Z11 Separate Cut-out for CPU Cooler Installation A separate cut-out for CPU cooler is provided for convenient CPU cooler installation without having to remove the motherboard from case. Zalman Z11 Rear Tube Apertures for Liquid Cooling Systems Tube cut-outs are provided at the rear of the case for convenient water cooling set-up & maintenance.