Key Design and Build Features

• Patterned Magnetic Dust Filters – Special pattern creates a unique chassis outlook and easy removal for cleaning.
• Modular I/O Panel – Adjustable to six locations on either side (front, top, or bottom) for flexible placement.
• Multiple Positioning Options – Supports vertical or horizontal case positioning to suit any setup.
• Edge-to-Edge Transparent Side Panel – Full-size acrylic panel showcases internal components.
• Clean Cable Routing Space – 28mm wide area behind motherboard tray for organized, hidden cable management.
• Perforated Panels for Airflow – Open design on front, top, and bottom ensures excellent thermal performance.

Cooling and Expansion Support

• Fan Support – Up to 6 fans: front (2x 120mm/140mm), top (2x 120mm), rear (1x 120mm); includes 1x 120mm (4.72") rear fan pre-installed.
• Radiator Compatibility – Front up to 240mm, rear up to 120mm, ensuring no performance compromises.
• Drive Bays – 0x external 5.25", 1x internal 3.5", 2x internal 2.5", total 3 expansion bays.
• Expansion Slots – 4 slots for graphics cards and other add-ons.
• Power Supply – Supports 1x ATX PSU (not included), bottom-mounted.

Comprehensive Technical Specifications

Why Choose Cooler Master MasterBox Q300L

Offers versatile build options with modular design, superior airflow, and ample cooling support in a compact mid-tower footprint, ideal for gamers and builders seeking performance without compromise.