PC Cases / Accessories

Cooler Master MasterBox 5 Case Review: Black with MeshFlow Front Panel Version (MCX-B5S1-KWNN-11)

A Closer Look at the Cooler Master MasterBox 5 (MCX-B5S1-KWNN-11) »

CM MasterBox 5 Windowed Black with MeshFlow Front PanelThe Canadian model for the MasterBox 5 was released initially several weeks ago (and was previously reviewed here at Modders-Inc) but the US version has finally arrived starting with two options for Americans to choose from: one black version and one white. The Cooler Master MasterBox 5 MCX-B5S1-KWNN-11 (black with MeshFlow Front Panel) comes bundled with a pair of 120mm fans, a PSU cover, a 3.5″ drive cage, a 2.5″ drive cage and a windowed side panel while the MasterBox 5 MCX-B5S2-WWNN-01 (white with darkmirror front panel) comes with the same configuration.

The MasterBox 5 ships in a brown box with black print, a classical approach to packaging as is expected of a case under $100. The foam padding is specifically customized for the MasterBox 5 case with a small cutout at the top for the accessories and manual that are exposed upon opening the top. The case itself is wrapped in a large plastic bag with the warranty information sheet also sitting on top.

You can tell from the box that this is the black version with seamless mesh front because the model number MCX-B5S1-KWNN-11 is printed at the top.

CM MasterBox 5 Windowed Black with MeshFlow Front Panel

The manual is a simple fold-out sheet illustrating the various combinations and flexible functions available with the MasterBox 5. The accessories are not sorted as is common with Cooler Master case accessories.

CM MasterBox 5 Windowed Black with MeshFlow Front Panel Accessories

Contents of the accessory pack:

  • 10x black zip-ties for cable management
  • 4-pin MOLEX to 3-pin fan power connector
  • 13x motherboard mounting screws
  • 7x motherboard stand-offs (two are already pre-installed)
  • 1x motherboard stand-off mounting adapter
  • 1x security lock accessory with 1x mounting screw
  • 8x 2.5″ screws
  • 4x matching pairs of tool-less fan mounting pins (four more pairs are already pre-installed with front intake fan)

Other accessories pre-installed inside the case:

  • 2x 120mm 3-pin fan
  • 1x CM StormGuard theft-prevention security tool


Product Number MCX-B5S1-KWNN-11
Available Color Black
Materials Steel body, Plastic mesh bezel
Dimensions (LxWxH) All Internal Structures 500 x 220 x 475mm
Motherboard Support E-ATX, ATX, Micro-ATX, Mini-ITX
Expansion Slots 7
Drive Bays 5.25″
Combo 3.5″ / 2.5″
Cages are Sold Separately
I/O Port USB 3.0 x 2, Audio in / out
Pre-installed Fan(s) Front
120mm x1
120mm x1
Fan Support Front
120mm / 140mm x2
120mm x1
Liquid Cooling Support Front
240mm / 280mm radiator, up to 50mm thickness without fan
120mm x1
Clearances CPU
167mm / 6.5″
180mm / 7.1″
285mm / 11.7″ (w/ 3.5″ HDD cage)
410mm / 16.1″ (w/o 3.5″ HDD cage)
Cable Routing Behind Motherboard Tray 25mm – 35mm
Dust Filters Front, bottom
Power Supply Support Bottom mount, ATX


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