Cooler Master MasterBox Q300L Midi-Tower Case with window, Black

The Cooler Master MasterBox Q300L is a Midi Tower chassis designed for Micro-ATX and Mini-ITX system builds. Its compact frame can be positioned either vertically or horizontally, providing flexibility for different desk or entertainment center setups. The exterior features patterned magnetic dust filters on the front and top panels, which facilitate maintenance and contribute to airflow. A key design element is the modular I/O panel, which can be relocated to multiple positions on the case frame for customized accessibility. The chassis includes a side window for viewing internal components.

Internally, the case provides a functional layout with specific component clearances. It supports CPU air coolers up to 157 mm in height and standard ATX power supplies with a maximum length of 160 mm, which are housed at the bottom. For storage, the configuration includes one 3.5-inch drive bay and two dedicated 2.5-inch bays. The thermal design accommodates a range of cooling hardware, including liquid cooling radiators up to 240 mm at the front and a 120 mm radiator at the rear. A single 120 mm fan is pre-installed in the rear exhaust position to establish an initial airflow path.

• Midi Tower form factor
• Supports Micro-ATX and Mini-ITX motherboards
• Dimensions of 230 x 378 x 387 mm
• Steel and plastic construction with a side window
• Front I/O panel with 2x USB 3.2 Gen 1 Type-A and audio jacks
• Accommodates one 3.5-inch and two 2.5-inch drives
• Provides 4 expansion slots
• CPU cooler clearance up to 157 mm
• PSU length clearance up to 160 mm
• Pre-installed with one 120 mm rear fan
• Supports front radiators up to 240 mm