Sealing Lip Noctua NV-MPG1-12.brown for 120mm fans — multi-purpose brown

Noctua NV-MPG1-12.brown is a multi-purpose sealing lip designed for 120 mm fans. It creates an acoustic and airflow seal between the fan frame and mounting surface, reducing vibration transmission and limiting air leakage. The brown sealing lip is compatible with standard 120 mm fan frames and is suitable for installations on cases, radiators and drive bays where a more effective seal and quieter operation are required.

Advantages

The sealing lip reduces airborne noise by minimising gaps between the fan and mounting surface, and it helps lower mechanical vibration transfer through the chassis. Made from a compliant material that conforms to typical 120 mm fan frames, it improves cooling efficiency by directing airflow through the fan rather than around it. The product is colour-matched for Noctua brown fan models and is simple to fit without modifying the fan or mounting points.

Suitable for

• 120 mm case fan installations
• Radiator-mounted fans in water-cooling loops
• Drive-bay or bracket-mounted cooling fans
• Situations requiring reduced vibration transfer or improved airflow sealing

Key specifications

• Form factor: designed for 120 mm fan frames
• Material: compliant sealing compound to match common fan frame profiles
• Function: acoustic and airflow sealing between fan and mounting surface
• Compatibility: fits standard 120 mm square fan frames without altering mounting holes
• Colour: brown, matching Noctua fan family aesthetics

How to use

Align the sealing lip with the perimeter of the 120 mm fan frame and press it into place so the lip contacts both the fan frame and the mounting surface. Ensure the lip sits flush along the entire fan perimeter to create a continuous seal; trim excess material only if necessary and using appropriate tools. After fitting, mount the fan normally to the case, radiator or bracket, verifying that screw heads or mounting hardware do not deform the lip in a way that compromises the seal.

Recommendations

Install the sealing lip on clean, dry surfaces and avoid overstressing it with overtightened screws. For radiator installations, check that the lip does not obstruct fin spacing or fan clearance. Periodically inspect the seal for compression or wear, and replace if the material hardens or no longer provides a continuous contact surface.