ASUS A21 PLUS Black
ASUS A21 PLUS Black
The ASUS A21 PLUS PC case is a compact micro-ATX case that combines support for modern components with thoughtful cable management and efficient cooling. The case is compatible with BTF motherboards, which allow connectors to be hidden on the underside of the board. Four pre-installed ARGB fans ensure sufficient cooling, while the front mesh panel with 40% porosity balances airflow, dust filtration, and RGB lighting visibility. Inside, you can fit micro-ATX and mini-ITX boards, water cooling radiators up to 360mm, graphics cards up to 380mm long, and CPU air coolers up to 165mm high. Storage is provided by one 2.5" bay and two combined 2.5"/3.5" bays suitable for both HDDs and SSDs. Cables can be neatly tucked away in a 33mm wide compartment behind the motherboard, which simplifies both assembly and maintenance. The case is available in two colour options with colour-matched internal I/O cables, and the top panel offers connections for a headphone, microphone, and two USB 3.2 Gen1 ports. With dimensions of 220 × 430 × 465 mm and a weight of 8.1kg, it is a suitable choice for modern compact builds.
220 × 430 × 465 mm
Size
165 mm
Maximum CPU cooler height
380 mm
Maximum graphics card length
4×
Number of pre-installed fans
0×
Number of fan bays
Key features of the ASUS A21 PLUS Black PC case
- The A21 PLUS case offers compatibility with hidden-connector motherboards for the cleanest possible cable management
- Supports up to 360mm radiators, graphics cards up to 380mm long, and CPU air coolers up to 165mm high
- Cooling is provided by four pre-installed ARGB fans
- The front panel has a mesh with 40% porosity, balancing airflow, dust filtration, and RGB lighting visibility
- A 33mm wide compartment behind the motherboard is designed for cable management
- The overall design combines functionality with aesthetics and ensures easy assembly
- The case is ideal for modern builds with an emphasis on a clean look and ventilation
Compatibility and cooling
The ASUS A21 PLUS is a PC case designed for standard PC builds with an emphasis on minimalism. It supports a variety of AIO coolers and graphics cards, while four pre-installed ARGB fans provide sufficient airflow to keep the system running smoothly. In addition to supporting standard mini-ITX and micro-ATX motherboards, the case is also compatible with the TUF GAMING B760M-BTF WIFI D4 board, whose connectors and headers are located on the underside for clean cable management.
Wide compatibility
Even though this is a micro-ATX case, the A21 PLUS supports up to 360mm radiators, graphics cards up to 380mm long, and CPU air coolers up to 165mm high, giving builders plenty of options for their new PC build.
Functional cooling
The A21 PLUS front panel mesh is 40% porous to maximise the balance between airflow and RGB lighting visibility. Four pre-installed ARGB fans ensure sufficient cooling.
Cable management and colour options
The A21 PLUS features a 33mm wide compartment behind the motherboard for stowing away cables. The case is available in two colour options with colour-matched black or white internal I/O cables that complement the overall look of the build.
Precise craftsmanship and functional design
The ASUS A21 PLUS impresses not only with its support for modern components but also with its thoughtful layout and clear cable management. Its compact 220 × 430 × 465 mm form factor provides plenty of room for micro-ATX and mini-ITX boards, radiators up to 360mm, and graphics cards up to 380mm long. Five PCIe slots provide ample room for expansion, which you'll appreciate when installing multiple components or planning future upgrades. The front mesh with 40% porosity ensures a balance between airflow and dust protection, while four pre-installed ARGB fans take care of system cooling. Additionally, a 33mm wide compartment behind the motherboard enables neat cable management.
Motherboard formats
- mATX (Micro ATX)
- mITX (Mini ITX)
Fans
- Front fan size: 2×140mm, 3×120mm
- Rear fan size: 1×120mm
- Top fan size: 2×140mm or 3×120mm
Ports
- 2× USB 3.2 Gen1
- Combined 3.5mm audio jack
Specifications
Usage and size
Colour
Internal structure
External structure
Cooling system
Backlight
Dimensions
| Code: | ACap21b |
| Warranty: | 24 months |
| Links: | Producer's Website: |
| Manufacturer information |
ASUSTek COMPUTER INC. 1F.,No.15, Lide Rd., Beitou Dist., Taipei City 112 Tel: +886-2-2894-3447 Tel: +886-2-2890-7798 https://gr.asus.com/ProductSafety ASUS COMPUTER GmbH Harkortstrasse 21-23 40880 Ratingen Germany, Europe Email: [email protected] ASUS COMPUTER GmbH, Harkortstrasse 21-23, 40880 Ratingen, Germany, Europe, [email protected] ASUS is a symbol of the growth of Taiwan's economy. The firm's beginnings date back to April 2, 1989, when as a small manufacturer of motherboards began his work with a few employees. Today, Asus employs more than 12,500 employees worldwide. ASUS products can be found in almost every category of the information technology marketplace. ASUS is focused on desktops, laptops, phones, optical drives and components. In the manufacture of motherboards, the company is now the dominant player with a staggering 40% market share. 
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