# Cooler Master MasterBox NR400 - mATX Mini Tower Case with Tempered Glass Side Panel, 2 x 120mm Pre-Installed Fans, Flexible Air Flow Configurations, Cable Management

- Category: Case
- Brand: Cooler Master
- Model: MasterBox NR400
- Part number: MCB-NR400-KGNN-S00
- Price (US): currently unavailable
- Price last checked: 2026-08-06
- Rating: 4.5/5 from 57 Amazon reviews
- Warranty: 2 years
- Product page: https://buildmypc.net/component-details/case/cooler-master-masterbox-nr400-mcb-nr400-kgnn-s00/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | Cooler Master |
| Model | MasterBox NR400 |
| Cabinet Type | MicroATX Mid Tower |
| Side Panel | Tempered Glass |
| Color | Black |
| Power Supply | N/A |
| Maximum 3.5 Drive Space | N/A |
| Maximum 2.5 Drive Space | N/A |
| GPU Length | 346 mm / 13.622" |
| Supported PSU Size | ATX |

## Key Features

- MINIMALIST DESIGN, OPTIMIZED PERFORMANCE - The NR400 features full mesh front & top panels to optimise internal air flow and cooling performance - the top panel includes a magnetic dust filter (and a fixed filter in the bottom panel)
- TEMPERED GLASS SIDE PANEL - System builds can be showcased through a flush tempered glass panel, which fastens discreetly via the back panel to ensure a smooth surface along the side of the chassis
- EXCELLENT FAN AND RADIATOR SUPPORT - Two 120mm fans come preinstalled in the front and rear panels - the front panel can support either 3 x 120 or 2 x 140mm fans and a radiator up to 280mm, while top supports 2 x 120/140mm fans or a 240mm radiator
- IMPRESSIVE CLEARANCES - Supports both micro-ATX and mini-ITX motherboards, CPU coolers up to 166mm in height, graphics cards up to 346mm in length, and and an ATX PS2 power supply up to 140mm in length (325mm without a front radiator or HDD cage)
- SMART INTERNALS - Cabling can be neatly routed through rubber grommets, while 22mm of clearance space behind the motherboard provides ample room for cable management - the HDD cage can be repositioned for a longer PSU or additional radiator space

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