# Montech AIR 903 MAX Mid-Tower PC Case > Montech AIR 903シリーズ summary. The Montech AIR 903 MAX is an E-ATX mid-tower case with pre-installed 140mm fans for excellent airflow. Tempered glass panel and wide component support make it ideal for gaming builds. Tags: case, montech, air-903-max, mid-tower, e-atx, high-airflow Source: https://www.amazon.co.jp/dp/B0C98RRPXL Article page: https://web-autoai.com/articles/montech-air-903?lang=en Prices and ratings change over time — check the article page for the current values. --- This article covers Montech AIR 903シリーズ. The Montech AIR 903 MAX is a mid-tower case designed for high airflow and E-ATX motherboard support. It comes with multiple 140mm fans pre-installed, so you can start building immediately without additional cooling purchases. The tempered glass side panel lets you show off your components and RGB lighting. Positioned as an upper mid-range case, it targets gamers and PC enthusiasts who want excellent thermal performance without sacrificing expandability. With support for E-ATX motherboards and room for multiple storage drives, the AIR 903 MAX offers flexibility for future upgrades. The focus on airflow — via a mesh front panel and large-diameter fans — makes it suitable for high-power components that generate significant heat. The case supports E-ATX (up to roughly 272mm width), ATX, Micro-ATX, and Mini-ITX motherboards. Power supply mounts at the bottom and accepts standard ATX units. Multiple 2.5-inch and 3.5-inch drive bays are available. Since exact clearances for GPU length and CPU cooler height are not confirmed from official sources, measuring your components or checking Montech's support page is recommended before assembly. Check the retailer's page for the latest price. It occupies a solid mid-to-high-tier position in the market, offering E-ATX compatibility, pre-installed 140mm fans, and a tempered glass panel — features often found on more expensive cases. Cooling is air-based, with multiple fans included to ensure good out-of-the-box thermal performance. First-time gaming PC builder: With pre-installed fans and tool-free drive bays, assembly is straightforward. E-ATX support means you can choose larger motherboards without worrying about fit. Airflow-focused enthusiast: The mesh front and large 140mm fans deliver excellent ventilation, ideal for high-TDP CPUs and GPUs in a gaming or workstation build. Builder wanting expandability: Room for multiple drives and support for large radiators (though not officially confirmed) make this case future-proof for upgrades. Official specifications for maximum GPU length, CPU cooler height, and radiator support are not fully documented in the available sources. Measure your components or contact Montech before finalizing a build. While the case is labeled E-ATX, some oversized E-ATX boards (304×330mm) may not fit — verify the motherboard dimensions. Q: Will an E-ATX motherboard definitely fit? A: It supports E-ATX up to about 272mm width. Larger extended ATX boards may not fit. Check your motherboard's exact dimensions against the case's motherboard tray specifications. Q: Can I install a 360mm liquid cooler radiator? A: The official radiator compatibility is not confirmed in available sources. The top panel likely supports 240mm or 360mm radiators, but verify the clearance with Montech before purchasing. Q: What power supply size works best? A: Standard ATX power supplies fit without issue. A fully modular unit is recommended for easier cable management, but any ATX PSU will work. ### Product Disclosure (Amazon) - Manufacturer: Montech - Seller: ネットショップOaR - Fulfilled by: ネットショップOaR - ASIN: B0C98RRPXL - Note: This article covers a manufacturer-made product based on Amazon listing details.