- 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
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
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360mm
Radiator
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380mm
Graphics Card Length
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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.

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.


Color-Coordinated Builds
Both variants of the A21 come with color-coordinated black or white internal I/O cables to compliment your build theme.
- All specifications are subject to change without notice. Please check with your supplier for exact offers. Products may not be available in all markets.
- PCB color and bundled software versions are subject to change without notice.
- Brand and product names mentioned are trademarks of their respective companies.
- Ultrabook, Celeron, Celeron Inside, Core Inside, Intel, Intel Logo, Intel Atom, Intel Atom Inside, Intel Core, Intel Inside, Intel Inside Logo, Intel vPro, Itanium, Itanium Inside, Pentium, Pentium Inside, vPro Inside, Xeon, Xeon Phi, and Xeon Inside are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries.
- Product specifications may differ from country to country. We recommend that you check with your local dealers for the specifications of the products available in your country. Colors of products may not be perfectly accurate due to variations caused by photography and monitor settings.Due to photographic variables and conditions, actual product appearance may differ from images shown on this site.Although we endeavor to present the most accurate and comprehensive information at the time of publication, we reserve the right to make changes without prior notice.
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*ASUS will not be responsible for customer induced damage to the product, or to user-added materials applied to the product.