Compact 21.3L mATX case with broad compatibility.. Supports M-ATX / Mini-ITX, 358mm 4-slot GPUs, and 140mm ATX PSUs.. Supports up to 360mm radiators with SFX PSU, or 240mm with ATX PSU.. Up to 168mm CPU cooler clearance, or 162mm with side fan bracket.. Includes 2 pre-installed 120 × 120 × 15mm slim top fans.. Supports up to 9 fans across top, side, bottom, rear, and front.. Removable top bracket simplifies CPU 8-pin routing and fan setup.. Removable front bracket allows easier large GPU installation.. Supports both horizontal and vertical layouts.. Optional Vertical AeroDeck adds up to 3 × 120mm or 2 × 140mm fans for GPU cooling.. Build like never B4. Co-developed with DAN Cases, the B4-mATX’s modular design unlocks versatile build possibilities. With multiple color, panel, and layout options, plus an optional accessory, it adapts to a wide range of styles.. Compact Design, Broad Compatibility. With a compact 21.3L volume, the B4-mATX delivers impressive hardware compatibility, supporting M-ATX motherboards, 360mm AIOs, 140mm ATX PSUs, and up to 358mm 4-slot GPUs.. Minimal Design,Multiple Styles. The B4-mATX offers a clean mesh panel for an airflow-focused look or a real wood panel for a warmer, refined setup. Both support front-to-back airflow, balancing cooling performance with a streamlined exterior.. Vertical Mode,Maximized Desk Space. The vertical layout improves desk space efficiency by up to 30%. Integrated rear feet allow quick and easy switching between different usage modes.. Rotatable AC Power Connector. Designed for both horizontal and vertical configurations, the rotatable AC inlet adapts to your setup. Face it outward for convenient cable access, or rotate it inward in vertical mode to avoid clearance limitations.. REVERSIBLE Rear Fan Bracket. The rear fan bracket features a reversible design for greater layout flexibility. It can be installed outward to create more clearance for liquid cooling, or inward to position the fan closer to the CPU airflow

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