ASUS A21 Plus Gaming case
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About This Item
- Compact microATX case with 220 mm width for space-efficient builds
- Supports up to 380 mm graphics cards and 16.5 cm CPU coolers
- Accommodates 360 mm radiators with versatile mounting options
- Features 2x USB 3.2 Gen 1 Type-A ports for fast connectivity
- Includes 4 pre-installed ARGB fans for enhanced cooling and aesthetics
- Supports both 2.5″ and 3.5″ drives with dedicated combo cage
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ASUS A21 PLUS | Compact ARGB Micro-ATX Gaming Case
The ASUS A21 PLUS Black is a compact micro-ATX case designed for gamers and PC builders who want high-performance airflow, ARGB lighting, and support for large radiators and graphics cards in a space-saving form factor.
Product Specifications
| Metric | Spec. |
|---|---|
| Motherboard Form Factor | microATX, Mini-ITX |
| Max GPU Length | 380 mm |
| Max CPU Cooler Height | 165 mm |
| Radiator Support | 360 mm front, 280 mm top |
| Front Fans | 3x 120 mm ARGB (included) |
ARGB Lighting & Pre-Installed Fans for Instant Style
The ASUS A21 PLUS Black comes with four pre-installed ARGB fans—three in the front and one in the rear—delivering vibrant lighting effects straight out of the box. The multi-colour illumination can be synchronised with compatible ASUS Aura Sync motherboards for a unified gaming aesthetic. This eliminates the need to buy extra fans or lighting kits, saving both time and cost.
Compact Yet Spacious for High-End Builds
Despite its compact footprint (220 x 430 x 465 mm), this case supports up to 380 mm graphics cards and 165 mm CPU coolers, making it suitable for powerful gaming rigs. The hidden-connector motherboard tray helps keep cables out of sight, while the five expansion slots allow for dual-slot GPUs and additional PCIe devices. Its small size fits easily on desks or in tight spaces without compromising build potential.
Superior Cooling Flexibility
Cooling is a priority in the A21 PLUS Black. It supports radiators up to 360 mm in the front and 280 mm on top, ideal for liquid cooling setups. Up to six fans can be installed—three front, one rear, and three top—offering excellent airflow for both air and liquid cooling configurations. The included ARGB fans provide both performance and visual appeal.
Drive Storage & Build Compatibility
The case includes a 2.5″/3.5″ combo cage for flexible storage options, supporting both SSDs and HDDs. With support for micro-ATX and Mini-ITX motherboards, it caters to a wide range of builds, from compact LAN rigs to full-featured gaming PCs. The PSU can be up to 210 mm long, accommodating most standard ATX power supplies.
Box contents
- ASUS A21 PLUS Black case
- 3x 120 mm ARGB front fans
- 1x 120 mm ARGB rear fan
- Mounting hardware and screws
- User manual
Key points to check
- Confirm your GPU length is under 380 mm
- Verify your CPU cooler height is under 165 mm
- Ensure your radiator fits within the supported sizes
- Check that your motherboard is micro-ATX or Mini-ITX
Common questions
Does the ASUS A21 PLUS Black support liquid cooling?
How many fans come pre-installed?
What motherboard sizes fit in this case?
Can I install a 3.5″ hard drive?
Is the case windowed?
Summary & warranty
The ASUS A21 PLUS Black is ideal for gamers and PC enthusiasts who want a compact, stylish case with strong cooling support and ARGB flair. Its ability to house large GPUs and radiators makes it a versatile choice for both air and liquid-cooled builds. Covered by the applicable manufacturer warranty.
| Number of 3.5 bays | 1 |
|---|---|
| Number of 2.5 bays | 1 |
| Supported motherboard form factors | micro ATX, Mini-ITX |
| Illumination colour | Multi |
| Illumination | Yes |
| Product colour | Black |
| Number of expansion slots | 5 |
| Maximum CPU cooler height | 16.5 cm |
| Maximum graphics card length | 38 cm |
| Maximum PSU length | 21 cm |
| Type | PC |
| USB 3.2 Gen 1 3.1 Gen 1 Type-A ports quantity | 2 |
| Front radiator sizes supported | 120,140,240,280,360 mm |
| Rear radiator sizes supported | 120 mm |
| Top radiator sizes supported | 120,140,240,280,360 mm |
| Front fans installed | 3x 120 mm |
| Number of front fans supported max | 3 |
| Front fans diameters supported | 120,140 mm |
| Rear fans installed | 1x 120 mm |
| Number of rear fans supported max | 1 |
| Rear fans diameters supported | 120 mm |
| Number of top fans supported max | 3 |
| Top fans diameters supported | 120,140 mm |
| HDD/SSD combo cage | Yes |
| Supported HDD sizes | 2.5,3.5″ |
| Width | 220 mm |
| Depth | 430 mm |
| Height | 465 mm |
| Weight | 8.1 kg |
| Package width | 525 mm |
| Package height | 493 mm |
| Package depth | 288 mm |
| Package weight | 9.8 kg |
| Distributor SKUs | W129021867, 540911, STD10231016, CL90DC00H0-B19010 |
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