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Aero RA click, BIS
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Reference: ST3450857SS

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90DC00H3-B09000
  • 90DC00H3-B09000

90DC00H3-B09000

Asus

ASUS A21, PC, White, micro ATX, Mini-ITX, Gaming, 6.5" (16.5 cm), 15" (38 cm)

CHF101.4
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Quantity
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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)
TypePC
Product colorWhite
Supported motherboard form factorsmicro ATX, Mini-ITX
Number of 3.5" bays2
Number of 2.5" bays1
Number of expansion slots5
Side windowYes
Suitable forGaming
Cable managementYes
Maximum CPU cooler height6.5" (16.5 cm)
Maximum graphics card length15" (38 cm)
Maximum PSU length8.27" (21 cm)
USB 2.0 ports quantity0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity2
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity0
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity0
Audio inputYes
Audio outputYes
Number of front fans supported (max)3
Front fans diameters supported120,140 mm
Number of rear fans supported (max)1
Rear fans diameters supported120 mm
Number of top fans supported (max)3
Top fans diameters supported120,140 mm
Front radiator sizes supported120,140,240,280,360 mm
Rear radiator sizes supported120 mm
Top radiator sizes supported120,140,240,280,360 mm
Width8.66" (220 mm)
Depth16.9" (430 mm)
Height18.3" (465 mm)
Weight16.1 lbs (7.3 kg)
Package width20.7" (525 mm)
Package depth11.3" (288 mm)
Package height19.4" (493 mm)
Package weight18.5 lbs (8.4 kg)
Product Details
2025-11-20
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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