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| Basic Information | ||
| Type | Standard | |
| Material | Steel | |
| Motherboard Compatibility | BTF, Mini-ITX, Micro-ATX | |
| Features | ||
| Cooling System | Pre-installed ARGB 4 x 120 mm | |
| Expansion Slots | 5 | |
| Front Ports | 2 x USB 3.2 Gen1, microphone jack, headphone jack | |
| Radiator Support | Up to 360mm (front/top), 120mm (rear) | |
| Fan Support | Front/Top: up to 3 x 120mm or 2 x 140mm; Rear: 1 x 120mm | |
| Pre- Installed Fans | 3 x 120mm ARGB front + 1 x 120mm ARGB rear | |
| Drive Bays | 2 x (2.5"/3.5" combo) + 1 x 2.5" bay | |
| I/O Port | 2 x USB 3.2 Gen1, microphone jack, headphone jack | |
| Clearance Space | ||
| Maximum CPU Cooler Height | 165mm | |
| Maximum GPU Card Length | 380mm | |
| Maximum PSU Length | 210mm | |
| Physical Specifications | ||
| Dimensions | 220 x 430 x 465mm | |
| Weight | 8.1kg | |
| Color | White | |
| Warranty Information | ||
| Warranty | No-Warranty | |
Build a cleaner, more organized PC with the ASUS A21 PLUS BTF Micro-ATX Mid Tower Gaming Case in White. This chassis is designed for modern builders who want better cable management and a tidy internal layout, thanks to ASUS BTF (Back-To-the-Future) motherboard compatibility. By routing cables behind the motherboard tray, the case helps reduce clutter in the main airflow path—an advantage for both gaming performance and everyday productivity builds where stable thermals matter.
The A21 PLUS BTF supports Mini-ITX and Micro-ATX motherboards, making it a strong choice for compact yet capable systems. If you’re planning a smaller gaming rig, a streaming workstation, or a creator PC that still needs room for a powerful graphics card, this form factor balance is especially practical. For best results in cable routing and overall neatness, BTF motherboards are recommended, but the case remains suitable for Mini-ITX and Micro-ATX setups.
Cooling is ready out of the box with pre-installed ARGB fans: three 120mm ARGB front fans and one 120mm ARGB rear fan. This means you can power up and enjoy both airflow and lighting immediately—ideal for users who want a polished look without extra fan purchases. For higher-performance builds, the case also supports extensive liquid cooling options, giving you flexibility to tailor thermal performance to your CPU and workload.
For liquid cooling enthusiasts, the ASUS A21 PLUS supports radiator mounts up to 360mm at the front and top, and 120mm at the rear. This allows you to choose configurations that match your cooling goals—front/top radiators can help maintain lower CPU temperatures during long gaming sessions, while rear support helps complete the exhaust path. In addition to liquid cooling, the chassis supports air cooling expansion with space for up to three 120mm or two 140mm fans on the front and top, plus one 120mm fan on the rear, supporting strong front-to-back airflow for consistent heat dissipation.
Designed to fit mainstream high-performance hardware, the case supports GPUs up to 380mm in length. That clearance makes it suitable for many powerful graphics cards, helping you avoid compatibility headaches when upgrading. It also supports CPU coolers up to 165mm in height, which is useful if you’re considering an air cooler for reliable everyday performance. For power supply compatibility, the A21 PLUS supports PSUs up to 210mm long, making it easier to pair with a wide range of power units for gaming and productivity systems.
With 5 expansion slots, the chassis offers room for additional components such as expansion cards and upgrades, supporting a more future-ready build approach. Storage support includes two 2.5"/3.5" combo bays and one dedicated 2.5" bay, allowing you to mix SSDs and HDDs based on your needs—fast boot and application performance with SSDs, plus larger capacity storage with HDDs when desired.
The front I/O panel includes two USB 3.2 Gen1 ports along with a microphone jack and a headphone jack. This is especially convenient for quick device connections like headsets, microphones, or external peripherals without reaching the back of the PC. It’s a practical feature for gamers who frequently swap audio devices and for streamers who need fast access to mic and headphone connections.
To keep airflow efficient over time, the case includes removable dust filters on the top, bottom, and right side. Regular cleaning helps maintain fan performance and can reduce dust buildup on internal components, which is beneficial for long-term reliability—particularly in environments with more dust or frequent system use.
The ASUS A21 PLUS measures 220 x 430 x 465mm and weighs 8.1kg, striking a balance between compact placement and a spacious internal layout. The chassis features a durable steel frame and a minimalist design in White, making it a great match for modern desks and setups where aesthetics and organization both matter. If you want a Micro-ATX case that supports strong GPU clearance, flexible radiator mounting, and BTF-focused cable management, the A21 PLUS is a well-rounded option for building a tidy, high-performance PC.
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