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| Basic Information | ||
| Type | Micro-ATX, Mini-ITX | |
| Motherboard Compatibility | Micro-ATX, Mini-ITX | |
| Side Panel Window | Tempered Glass | |
| Features | ||
| Cooling System | Front mesh (40% porous) for airflow; supports up to 360mm radiators and 7 fan slots | |
| Front Ports | 2 x USB 3.2 Gen1; 1 x headphone; 1 x microphone | |
| Radiator Support | Up to 360mm radiators | |
| Fan Support | Up to 7 fan slots | |
| Drive Bays | 2 x 3.5-inch bays, 1 x 2.5-inch bay | |
| I/O Port | Front/top USB 3.2 Gen1 (2 ports) and audio (headphone + microphone) | |
| Clearance Space | ||
| Maximum CPU Cooler Height | Up to 165mm | |
| Maximum GPU Card Length | Up to 380mm | |
| Physical Specifications | ||
| Dimensions | 465 x 243 x 520mm | |
| Weight | 7.3 kg | |
| Color | Black | |
| Warranty Information | ||
| Warranty | No Warranty | |
The ASUS A21 Mesh Micro-ATX Mid Tower Gaming Case in a sleek black finish is built for gamers and PC builders who want a clean look, strong airflow, and practical internal organization. Designed to support Micro-ATX and Mini-ITX motherboards, it’s an excellent choice for compact gaming rigs that still need room for a capable graphics card and efficient cooling. The tempered glass side panel lets you showcase your components while keeping the build visually impressive from every angle.
Cooling is a core strength of the A21. The front panel features a mesh design that is 40% porous, helping hot air escape more effectively while improving overall ventilation. This airflow-focused layout is especially helpful during long gaming sessions or when running demanding applications, where stable temperatures can support consistent performance. Compared to more restrictive front panels, a mesh front typically helps reduce heat buildup and makes it easier to maintain a comfortable internal environment for your GPU and CPU.
Whether you prefer air cooling or liquid cooling, the A21 gives you customization options. It supports CPU air coolers up to 165mm in height, making it compatible with a wide range of air-cooling solutions for everyday gaming and high-load workloads. For liquid cooling enthusiasts, the case supports radiators up to 360mm, giving you the freedom to plan a cooling setup that matches your performance goals. In addition, it provides support for seven fan slots, so you can balance intake and exhaust airflow for better thermal control.
The tempered glass side window provides a clear view of your build, allowing RGB lighting and component details to stand out. This is ideal for users who want their setup to look as good as it performs—whether you’re building a streaming PC, a gaming workstation, or a showpiece desktop. The glass also helps create a premium, modern aesthetic compared to solid side panels that hide internal components.
The ASUS A21 is engineered to fit key components without forcing compromises. It supports graphics cards up to 380mm in length, which is useful when pairing with mid-to-high range GPUs. For the CPU, it supports air coolers up to 165mm, helping you choose a cooler that can handle sustained performance. This combination makes the A21 a practical platform for balanced gaming builds where both GPU power and CPU thermals matter.
Cable management is simplified with a 33mm wide compartment behind the motherboard. Keeping cables neatly routed improves airflow by reducing obstructions and also makes future upgrades easier—such as swapping GPUs, adding storage, or changing cooling components. For builders who value a tidy interior, this space helps maintain a clean, professional-looking build while supporting better internal ventilation.
For daily convenience, the case includes front/top USB ports (2 x USB 3.2 Gen1) along with audio ports (1 x headphone, 1 x microphone). This front I/O setup is convenient for connecting headsets, microphones, and fast USB devices without reaching behind the desk. Storage support includes two 3.5-inch drive bays and one 2.5-inch drive bay, making it suitable for mixed storage setups—such as combining larger capacity drives with faster SSD storage for games and applications.
The ASUS A21 supports Micro-ATX and Mini-ITX motherboards, making it a strong option for compact gaming builds and space-conscious setups. It also features a single power button for straightforward operation, helping you start and manage your system with minimal hassle. With dimensions of 465 x 243 x 520mm and a weight of 7.3 kg, it’s designed to be stable on a desk while still being manageable for upgrades.
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