The ASUS A21 micro-ATX case offers support for 360 mm radiators, and 380 mm graphics card, with two color options and clean cable management.
  • 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.
ASUS A21 Case
ASUS A21 White Edition case rear view
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The ASUS A21 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly.

Broad Compatibility

Despite being a micro-ATX case, the A21 still supports up to 360 mm radiators, graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height, giving builders plenty of options to assemble their next PC.

ASUS A21 PC build glass side panel of the ASUS A21 PC case

Support

  • 360 mm all-in-one cooler icon

    360mm

    Radiator

  • ROG Strix RTX 40 series graphics card icon

    380mm

    Graphics Card Length

  • Tower CPU Cooler icon

    165mm

    CPU Cooler Height

Capable Cooling

The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures.

Front angle of the ASUS A21 PC build featuring three 120 mm fans

40 % porosity

Ample Cable Management

The A21 provides a compartment behind the motherboard that is 33 mm wide to help you keep your wiring tucked away and tidy.

Rear side of the ASUS A21 PC Case without side panel highlight on the 33 mm wide cable management space of ASUS A21 PC Case

Color-Coordinated Builds

Both variants of the A21 come with color-coordinated black or white internal I/O cables to compliment your build theme.

One black ASUS A21 PC build and one white ASUS A21 PC build
Rear side of ASUS A21 PC Case and its color-matched cables
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