TAC Compliant Unique upper and lower chamber structure The power supply resides in a separate chamber to isolate heat from the system and lower system noise Innovative three-layer side panel (aluminum, plastic, aluminum) dampens system generated noise, making this one of the quietest cases available No Power supply included. To optimize performance of the P180 the choice of power supply is crucial. Antec recommends choosing from our SP-500 power supply or Phantom, Neo/NeoHE or TruePower 2.0 series. Cooling System: - 1 rear 120mm Tricool fan (standard) with 3-speed control to balance quiet with cooling - 1 top (standard) 120mm TriCool Fan - 1 lower chamber (standard) 120mm x 38mm (thick) TriCool Fan - Antec Quiet Computing Air Duct for better, quiet cooling of the graphics card - 1 front (optional) 120mm fan - 1 80mm fan (optional) for graphics cards 11 Drive Bays: - 4 x 5.25" external drive bays - 1 x 3.5" external drive bays - 6 x 3.5" internal drive bays Fits Micro ATX (9.6" x 9.6") and Standard ATX (12"x 9.6") motherboards Front mounted USB, IEEE 1394 (FireWire®,i.Link®) & Audio ports Double hinge door design: allows the door to open up to 270º Material: 0.8mm cold rolled steel for durability through the majority of chassis, 1.0mm cold rolled steel around the 4x HDD area. Built-in washable air filter keeps harmful dust out of your case. Built-in toolbox so you can carry small parts with your case. Look on the back of the upper chamber removable HDD cage.