The ASUS A21 is a budget-friendly micro-ATX PC case known for its high airflow potential, ample component support, and clean aesthetic. It is available in both black and white and is compatible with back-connect motherboards like ASUS's BTF series. A key feature is the 40% porous mesh front panel, which balances airflow, dust filtration, and RGB visibility
Motherboard support: Micro-ATX, Mini-ITX, and BTF (Back-To-the-Future) standard motherboards.
Dimensions (W x H x D): 220 x 430 x 465 mm.
Expansion slots: 5.
Drive bays: One dedicated 2.5-inch bay and two combo 2.5-inch / 3.5-inch bays.
Maximum GPU length: 380 mm.
Maximum CPU cooler height: 165 mm.
Maximum PSU length: 210 mm.
Radiator support:
Front: Up to 360mm / 280mm / 140mm / 120mm
Top: Up to 360mm / 280mm / 140mm / 120mm
Rear: 120mm
Fan support:
Front: 3 x 120mm or 2 x 140mm
Top: 3 x 120mm or 2 x 140mm
Rear: 1 x 120mm
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