ASUS A21 Micro-ATX Case White

  • Broad Compatibility: A21 supports up to 360 mm radiators, graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height.
  • Capable Cooling: The front-panel mesh is 40% porous to maximize the balance of airflow, dust filtering and RGB visibility.
  • Ample cable management: The A21 provides a compartment behind the motherboard that is 33 mm wide to keep your wiring tucked away and tidy.


Lay the foundation for your next small form factor build using the white ASUS A21 Mid-Tower Case. With support for micro-ATX and mini-ITX motherboards, this case takes up less space on your desk without sacrificing powerful compatibility, making it perfect for those who game in compact spaces.

Featuring a steel frame and tempered glass side panel, the A21 case features five expansion slots, a 2.5″ drive bay, and two drive bays that fit either 2.5 or 3.5″ drive bays for future additions and storage expansion.

Two USB-A 3.2 Gen 1 ports can be used for peripherals like a mouse and keyboard. The input and output 3.5mm audio jacks allow you to connect headphones and a microphone to your system.
Fan and Radiator Support
To cool your system, this case supports up to three 120mm or two 140mm fans in the front and top panels and a single 120mm fan in the back. For water cooling, radiators up to 360mm can fit in the front or top while the rear can hold a 120mm radiator.
Component Support
This case fits GPUs up to 380mm long, PSUs up to 210mm long, and CPU coolers up to 165mm in height. BTF hidden-connector motherboards are also compatible with this case, and with the 3mm-wide rear compartment, you can maximize clean cable management.
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