PC case Montech AIR 903 BASE Midi Tower White

The Montech AIR 903 BASE Midi Tower in white is a mid-tower PC case designed for strong airflow and broad component compatibility. The case features a metal front panel with extensive ventilation, pre-installed 3x 140 mm PWM fans (two front, one rear), and support for large GPUs and multiple cooling configurations. It accommodates ATX and E-ATX motherboards, offers ample storage mounting for 3.5" and 2.5" drives, and includes practical cable management features for a tidy build.

Advantages

The AIR 903 BASE provides a high front ventilation rate to maximize airflow and improve thermal performance while maintaining easy-to-clean dust filters and a quick-release design. With three pre-installed HP140 PWM fans, the case balances cooling performance and noise control. It supports extensive cooling options including up to 9 fans and 360 mm AIO radiators front and top, and offers generous clearance for large graphics cards and tall CPU coolers. Cable routing is simplified by a 27 mm routing channel, rubber grommets and Velcro straps.

Suitable for

• Gaming desktop builds with large graphics cards (up to 400 mm length, 190 mm width)
• High-performance systems requiring multiple fans or 360 mm AIO radiators
• Workstation or content-creation builds using ATX or E-ATX motherboards
• Builders who prefer easy dust maintenance and clean cable management

Key specifications

• Form factor: Midi Tower
• Supported motherboards: ATX, E-ATX, Micro ATX, Mini-ITX
• Pre-installed fans: 3 x 140 mm PWM (2 front, 1 rear)
• Fan support: up to 9 fans; front/top support for 360 mm AIO
• Drive bays: 2 x 3.5" and 5 x 2.5"
• GPU clearance: up to 400 mm length and 190 mm width
• Dimensions (W x D x H): 230 x 478 x 493 mm
• Case color: White
• Weight: 7.6 kg
• Front I/O: 2 x USB 3.2 Gen 1 Type-A

How to use

Install the chosen motherboard on the pre-punched standoffs, route power and data cables through the 27 mm cable channel and rubber grommets, and secure drives in the designated 3.5" or 2.5" bays. Configure fans and connect the pre-installed HP140 PWM fans to the motherboard fan headers or a controller. When installing large GPUs or vertical mounting (vertical mount sold separately), remove the necessary PCIe slot covers and ensure adequate clearance for airflow. Use the quick-release front panel and dust filters for routine cleaning.

Recommendations

For optimal cooling and lowest noise, use PWM fan control via motherboard headers and maintain the front and top dust filters regularly. When installing very long or wide GPUs, check clearance including cables and aftermarket coolers; for vertical GPU mounting, use the official Montech vertical mount kit sold separately.