ASUS A21 Micro-ATX Gaming Case – Black
The ASUS A21 Black is a compact high-airflow Micro-ATX gaming case designed for clean and powerful PC builds. It supports BTF hidden-connector motherboards, graphics cards up to 380mm, CPU coolers up to 165mm, and 360mm radiators at both the front and top. Its 40%-porous mesh front panel and spacious 33mm cable-management area help deliver efficient cooling and a clean interior.
Product Overview
The ASUS A21 combines a compact Micro-ATX footprint with generous component compatibility. Its high-airflow mesh front panel has 40% porosity, designed to balance airflow, dust filtering, and visibility while providing plenty of ventilation for performance-oriented gaming systems.
Despite its compact dimensions, the A21 accommodates graphics cards up to 380mm long, CPU air coolers up to 165mm high, and power supplies up to 210mm long. It supports Micro-ATX and Mini-ITX motherboards, including compatible ASUS BTF hidden-connector motherboards for cleaner cable routing.
Cooling support is extensive, with room for three 120mm or two 140mm fans at the front, the same configuration at the top, and one 120mm rear fan. Radiators up to 360mm can be installed at both the front and top, with up to a 120mm radiator at the rear.
A 33mm-wide cable-management compartment behind the motherboard provides additional space for routing and concealing cables, helping builders achieve a cleaner-looking system. Unlike the A21 PLUS, the standard A21 does not include the four pre-installed ARGB fans found on the PLUS version.
Please check the official manufacturer website for the latest and most accurate compatibility, clearance, radiator, fan, and I/O specifications before purchase or finalizing a build.
Key Features
- 🖤 Black Edition
- 🖥️ Compact Micro-ATX Gaming Case
- 🌬️ 40% Porous Mesh Front Panel
- 🔌 BTF Hidden-Connector Motherboard Compatible
- 🔲 Micro-ATX / Mini-ITX Support
- 🎮 Up to 380mm GPU Length
- ❄️ Up to 165mm CPU Cooler Height
- ⚡ Up to 210mm PSU Length
- 💧 Up to 360mm Front Radiator
- 💧 Up to 360mm Top Radiator
- 🌀 Up to 7 × 120mm Fans
- 🧰 33mm Cable Management Space
- 🪟 Tempered-Glass Side Panel
- 💾 Flexible SSD/HDD Storage Support
- ⚫ Color-Coordinated Black Internal Cables
Technical Specifications
| Category | Cases |
| Manufacturer | ASUS |
| Model | A21 Black |
| Case Type | Mid-Tower PC Case |
| Motherboard Support | Micro-ATX / Mini-ITX |
| GPU Clearance | 380mm |
| Radiator Support | Please Check Official Specifications |
| Included Fans | N/A |
| Front I/O | 2 × USB 3.2 Gen 1 / Headphone / Microphone |
| PSU | Not Included / Please Check Official Specifications |
| Color | Black |
| Warranty | 1 Year Manufacturer Warranty |
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