Asus A21 White M-ATX Mid Tower Case

The ASUS A21 White is a compact Micro-ATX mid-tower PC case designed for mainstream DIY builders who want a clean, minimalist aesthetic without sacrificing hardware compatibility or airflow performance. Built with a white finish and a mesh front panel, the A21 balances visual appeal with practical thermal performance in a form factor that suits space-conscious desks and smaller workspaces. Despite its compact Micro-ATX footprint, the A21 punches well above its size class in terms of cooling headroom. The front panel supports up to a 360mm radiator, giving builders the freedom to install high-performance AIO liquid coolers typically reserved for larger enclosures. The same 360mm radiator support is available on the top panel as well, while the rear accommodates a single 120mm radiator or fan for exhaust. In total, the case supports up to seven fans across front (3x120mm or 2x140mm), top (3x120mm or 2x140mm), and rear (1x120mm) positions. The front mesh panel features a 40% porosity design that helps maximise airflow intake while providing a degree of dust filtration. This makes the A21 suitable for sustained workloads where heat dissipation matters. A front dust filter is included to help keep internals clean over time. Builders with large graphics cards will appreciate the 380mm maximum GPU clearance, which accommodates most current-generation triple-slot cards. CPU air coolers up to 165mm tall are also supported, giving air-cooling enthusiasts solid options alongside AIO alternatives. The PSU bay accepts power supply units up to 210mm in length. Cable management is handled through a dedicated compartment behind the motherboard tray that is 33mm wide — enough depth to route and conceal most cable runs cleanly. The case supports Micro-ATX and Mini-ITX motherboards, five expansion slots, and a drive configuration of one 2.5-inch SSD bay plus two combination 2.5-inch/3.5-inch bays for mixed storage setups. The front I/O panel provides two USB 3.2 Gen1 ports, a headphone jack, and a microphone port — a straightforward selection suited to everyday usage. Verified Specifications: - Form Factor: Micro-ATX Mid Tower - Motherboard Support: Micro-ATX, Mini-ITX - Colour: White - Dimensions: 220 x 430 x 465 mm - Weight: 7.3 kg - Front Panel Mesh Porosity: 40% - Max GPU Length: 380 mm - Max CPU Cooler Height: 165 mm - Max PSU Length: 210 mm - Radiator Support (Front/Top): up to 360mm; (Rear): 120mm - Fan Support: up to 7 total (3x120mm/2x140mm front; 3x120mm/2x140mm top; 1x120mm rear) - Drive Bays: 1x 2.5" + 2x 2.5"/3.5" combo - Expansion Slots: 5 - Front I/O: 2x USB 3.2 Gen1, 1x Headphone, 1x Microphone - Dust Filters: Front - Cable Management Clearance: 33mm behind motherboard tray - Warranty: 1 Year