The ASUS A21 micro-ATX case offers broad compatibility, supporting up to 360 mm radiators and graphics cards up to 380 mm in length, with CPU air coolers up to 165 mm in height. Its front-panel mesh is 40% porous, maximizing airflow, dust filtering, and RGB visibility. The case also provides ample cable management with a 33 mm wide compartment behind the motherboard to keep wiring tidy. Crafted for minimalist mainstream DIY PC builders, the ASUS A21 is designed to keep components running smoothly with excellent airflow potential.