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Reference: ST3450857SS
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Description
The ASUS A21 micro-ATX case offers support for 360 mm radiators, and 380 mm graphics card, with two color options and clean cable management.
DISCOVER HIDDEN POTENTIAL
The ASUS A21 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly.
BROAD COMPATIBILITY
Despite being a micro-ATX case, the A21 still supports up to 360 mm radiators, graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height, giving builders plenty of options to assemble their next PC.
CAPABLE COOLING
The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures.
AMPLE CABLE MANAGEMENT
The A21 provides a compartment behind the motherboard that is 33 mm wide to help you keep your wiring tucked away and tidy.
COLOR-COORDINATED BUILDS
Both variants of the A21 come with color-coordinated black or white internal I/O cables to compliment your build theme.
ASUS A21. Type: PC, Product color: White, Supported motherboard form factors: micro ATX, Mini-ITX. Front fans diameters supported: 120,140 mm, Rear fans diameters supported: 120 mm, Top fans diameters supported: 120,140 mm. Width: 8.66" (220 mm), Depth: 16.9" (430 mm), Height: 18.3" (465 mm). Package width: 20.7" (525 mm), Package depth: 11.3" (288 mm), Package height: 19.4" (493 mm)
DISCOVER HIDDEN POTENTIAL
The ASUS A21 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly.
BROAD COMPATIBILITY
Despite being a micro-ATX case, the A21 still supports up to 360 mm radiators, graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height, giving builders plenty of options to assemble their next PC.
CAPABLE COOLING
The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures.
AMPLE CABLE MANAGEMENT
The A21 provides a compartment behind the motherboard that is 33 mm wide to help you keep your wiring tucked away and tidy.
COLOR-COORDINATED BUILDS
Both variants of the A21 come with color-coordinated black or white internal I/O cables to compliment your build theme.
ASUS A21. Type: PC, Product color: White, Supported motherboard form factors: micro ATX, Mini-ITX. Front fans diameters supported: 120,140 mm, Rear fans diameters supported: 120 mm, Top fans diameters supported: 120,140 mm. Width: 8.66" (220 mm), Depth: 16.9" (430 mm), Height: 18.3" (465 mm). Package width: 20.7" (525 mm), Package depth: 11.3" (288 mm), Package height: 19.4" (493 mm)
| Type | PC |
| Product color | White |
| Supported motherboard form factors | micro ATX, Mini-ITX |
| Number of 3.5" bays | 2 |
| Number of 2.5" bays | 1 |
| Number of expansion slots | 5 |
| Side window | Yes |
| Suitable for | Gaming |
| Cable management | Yes |
| Maximum CPU cooler height | 6.5" (16.5 cm) |
| Maximum graphics card length | 15" (38 cm) |
| Maximum PSU length | 8.27" (21 cm) |
| USB 2.0 ports quantity | 0 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity | 0 |
| USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity | 0 |
| Audio input | Yes |
| Audio output | Yes |
| Number of front fans supported (max) | 3 |
| Front fans diameters supported | 120,140 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 |
| 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 |
| Width | 8.66" (220 mm) |
| Depth | 16.9" (430 mm) |
| Height | 18.3" (465 mm) |
| Weight | 16.1 lbs (7.3 kg) |
| Package width | 20.7" (525 mm) |
| Package depth | 11.3" (288 mm) |
| Package height | 19.4" (493 mm) |
| Package weight | 18.5 lbs (8.4 kg) |
Product Details
2025-11-24
New
Data sheet
- Type
- PC
- Product color
- White
- USB 2.0 ports quantity
- 0
- USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
- 2
- Weight
- 16.1 lbs (7.3 kg)
- USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity
- 0
- USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity
- 0
- Width
- 8.66" (220 mm)
- Height
- 18.3" (465 mm)
- Depth
- 16.9" (430 mm)
- Package weight
- 18.5 lbs (8.4 kg)
- Package width
- 20.7" (525 mm)
- Package depth
- 11.3" (288 mm)
- Package height
- 19.4" (493 mm)
- Audio input
- Yes
- Cable management
- Yes
- Suitable for
- Gaming
- Audio output
- Yes
- Number of 3.5" bays
- 2
- Supported motherboard form factors
- micro ATX, Mini-ITX
- Number of 2.5" bays
- 1
- Side window
- Yes
- Number of front fans supported (max)
- 3
- Front fans diameters supported
- 120,140 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
- 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
- Number of expansion slots
- 5
- Maximum CPU cooler height
- 6.5" (16.5 cm)
- Maximum graphics card length
- 15" (38 cm)
- Maximum PSU length
- 8.27" (21 cm)
Specific References
- ISBN
- 978-1-23456-789-0
- MPN
- 90DC00H3-B09000
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ASUS A21, PC, White, micro ATX, Mini-ITX, Gaming, 6.5" (16.5 cm), 15" (38 cm)