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.

Discover Hidden Potential
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.

Support
- 360mm Radiator
- 380mm Graphics Card Length
- 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.

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

Tech Specs
Model
- ASUS A21 Case
Motherboard Support
- BTF motherboard compatible
- Mini-ITX
- Micro-ATX
Drive Bays
- 2 x 2.5″/3.5″ Combo Bay
- 1 x 2.5″ Bay
Expansion Slots
- 5
Front I/O Port
- 2 x USB 3.2 Gen1
- 1 x Microphone
- 1 x Headphone
Radiator Support (Front)
- 360 mm
- 280 mm
- 240 mm
- 140 mm
- 120 mm
Radiator Support (Top)
- 360 mm
- 280 mm
- 240 mm
- 140 mm
- 120 mm
Radiator Support (Rear)
- 120 mm
Cooling Support (Front)
- 2 x 140 mm
- 3 x 120 mm
Cooling Support (Top)
- 2 x 140 mm
- 3 x 120 mm
Cooling Support (Rear)
- 1 x 120 mm
Maximum CPU Cooler Height
- 165 mm
Maximum GPU Length
- 380 mm
Maximum PSU Length
- 210 mm
Dimensions
- 220*430*465 mm
Weight
- 7.3Kg
BTF motherboard compatible
- Yes
| Brand | ASUS |
|---|---|
| Color | Black |
| Warranty | Official Warranty |
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