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Cooler Master MasterBox Q300L


MasterBox Q300L

Patterned Magnetic Dustfilters

Special pattern on the dust filter creates a unique outlook for the chassis.

Modular I/O Panel

The I/O panel can be adjusted to six different locations. On both side of the body you can install the I/O panel at the front, top or bottom.

Ultiple Positioning Options

The case can be put in vertical or horizontal position.

Edge-To-Edge Side Panel

Show off your build through the full size transparent side panel.

Clean Routing Space

Behind the mother-board tray, it offers 28mm wide and spacy room for hidden cable management.

Excellent Thermal Performance

The open design of the perforated front, top and bottom guarantees excellent thermal performance.

Fan And Radiator Support

The front supports up to two 140mm fans and up to a 240mm radiator. The rear supports a 120mm fan or radiator and the top two 120mm fans. All to ensure you don't have to compromise on performance.


Model Number

MasterBox Q300L MCB-Q300L-KANN-S00

Fan Support

Front = 120 / 140mm x 2 Top = 120mm x 2 Rear = 120mm x 1 Bottom = 120mm x 1

Dimensions L x W x H

387 x 230 x 378mm

Pre-Installed Fans

Front N/A Rear 120mm x 1

Radiator Support

Front 120mm x 1 / 240mm x 1 Rear 120mm x 1


CPU Cooler 157mm PSU 160mm GPU 360mm


Steel, Plastic

Power Supply Support

Bottom mount, ATX PS2



Drive Bays

5.25" = 0 3.5" HDD = 1 2.5" SSD = 2

Motherboard Support

Micro-ATX, Mini-ITX

I/O Panel

USB 3.0 x 2, Audio In / Out

Expansion Slots



2 Years


Price, feature and specifications are subject to change without notice


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