ASUS A21 mATX CASE Tempered Glass

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.

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.

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.

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.

The A21 provides a compartment behind the motherboard that is 33 mm wide to help you keep your wiring tucked away and tidy.

Both variants of the A21 come with color-coordinated black or white internal I/O cables to compliment your build theme.


Product id 894843
Brand AsusTek
Partnr 90DC00H0-B09000
EAN/UPC code
Warranty (months) 24 months
Type PC
Product colour Black
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 Y
Suitable for Gaming
Cable management Y
Maximum CPU cooler height 165 mm
Maximum graphics card length 380 mm
Maximum PSU length 210 mm
Ports & interfaces
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity 2
Audio input Y
Audio output Y
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 fan sizes supported 120, 140, 240, 280, 360 mm
Rear radiator fan sizes supported 120 mm
Top radiator fan sizes supported 120, 140, 240, 280, 360 mm
Weight & dimensions
Width 220 mm
Depth 430 mm
Height 465 mm
Weight 7300 g
Packaging data
Package width 525 mm
Package depth 288 mm
Package height 493 mm
Package weight 8400 g