Montech AIR 903 BASE
Montech AIR 903 BASE
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The Airflow Champion: Montech AIR 903 BASE
Meet the Montech AIR 903 BASE, the case built for maximum airflow and incredible value. It comes ready to go with three powerful 140mm PWM fans, a mesh front panel, and a spacious interior to keep even the most powerful gaming components cool. Its clean, all-white design and tempered glass side panel let you show off your build in style, making it the perfect foundation for a high-performance PC that breathes easy.
⭐ Highlights
⭐ Highlights
Ultra-High Airflow Mesh Front | 3x 140mm PWM Fans Pre-Installed | 400mm GPU Clearance (RTX 4090 Ready) | Dual 360mm Radiator Support | USB Type-C Front I/O
⚙️ Specifications
⚙️ Specifications
Case Form Factor: Mid-Tower
Motherboard Compatibility: E-ATX, ATX, Micro-ATX, Mini-ITX
Case Dimensions: 478 x 230 x 493 mm (D x W x H)
Max GPU Length: 400 mm
Max CPU Cooler Height: 180 mm
Radiator Support: Top: 360mm / 280mm, Front: 360mm / 280mm, Rear: 120mm
Drive Bays: 2 x 3.5" HDD bays, 5 x 2.5" SSD mounts
Fan Support: Front: 3 x 140mm or 3 x 120mm, Top: 2 x 140mm or 3 x 120mm, Rear: 1 x 140mm or 1 x 120mm
Front Panel I/O: 1 x USB-C, 2 x USB 3.0, Headphone/Mic combo jack
Case Material: Steel, Tempered Glass, Mesh
Side Panel Type: Tempered Glass
Included Fans: 3 x 140mm PWM Fans (non-RGB)
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The POST-Check Protocol
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Component Clearance
Action: Double-check the case's specifications for maximum GPU length, CPU cooler height, and radiator support before purchasing any part. Why: These are fixed limitations; if your CPU cooler is too tall or your GPU is too long, the side panel won't close or the components will physically block installation.
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Standoff Alignment
Action: Verify the case has motherboard standoffs installed only in the locations that correspond to the holes on your specific motherboard (ATX, Micro-ATX, etc.). Why: Incorrectly placed standoffs can touch the back of the motherboard and cause a disastrous electrical short when the system is powered on.
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I/O Panel Installation
Action: If the case uses a removable I/O shield (not pre-installed on the motherboard), snap it into the casebefore mounting the motherboard. Why: This is a common beginner mistake that forces you to remove the entire motherboard just to fit a small metal plate.
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Airflow Pathway
Action: Follow the simple rule: Intake fans at the front/bottom draw cool air in, and Exhaust fans at the rear/top push hot air out. Why: A balanced, directed airflow path is the single most important factor for overall system temperature and long-term component health.
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PSU Fan Direction
Action: When mounting the Power Supply Unit (PSU) at the bottom of the case, ensure its fan is facing downward toward the case's dust filter and external vent. Why: This configuration allows the PSU to pull cool, filtered air directly from outside the case, keeping its own temperature low and promoting overall case airflow.
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Front Panel Headers
Action: Use the motherboard manual to correctly connect the tiny Front Panel Header cables (Power Button, Reset, USB, Audio) to the correct pins on the motherboard. Why: These small cables are essential for powering the system on and are often confusingly labeled, but the manual is the only sure guide for proper function.