Cooling radiator Alphacool R27-S120 120mm, 18 FPI, copper fins

Alphacool R27-S120 is a compact 120mm cooling radiator with 18 FPI (fins per inch) and copper fins engineered for liquid cooling loops in PC systems. The radiator is intended for use where space is limited and for single-fan configurations, providing effective heat transfer from coolant to ambient air. Copper fins increase thermal conductivity and corrosion resistance compared with many aluminium alternatives, helping to reduce coolant temperatures and support stable component operation.

Advantages

The combination of a 120mm form factor and 18 FPI offers a balance between airflow resistance and surface area for heat dissipation, making the radiator suitable for moderate-flow pumps and high-static-pressure fans. Copper fins deliver improved thermal transfer and long-term durability. Its compact dimensions and standard mounting points simplify installation in compact cases or custom loop segments where a full-size radiator is not practical.

Suitable for

• Small form factor PC builds with limited radiator space
• Single-fan liquid cooling loops and localized cooling points
• Custom cooling loops requiring a durable copper-fin heat exchanger
• Systems where moderate FPI supports airflow and pump capabilities

Key specifications

• Radiator size: 120mm
• Fin density: 18 fins per inch (FPI)
• Fin material: copper
• Designed for single-fan configuration
• Compatibility: standard 120mm fan mounting pattern

How to use

Mount the Alphacool R27-S120 in a location that provides adequate airflow for a 120mm fan, aligning the fan with the radiator’s mounting holes and securing with appropriate screws. Connect the inlet and outlet to the rest of the liquid cooling loop using compatible fittings and tubing, ensuring leak-free seals. Bleed trapped air from the loop and verify pump and fan operation before full system use. Monitor coolant temperatures during initial runs and adjust fan speed or pump flow as needed to reach desired thermal performance.

Recommendations

Use a high-static-pressure 120mm fan for optimal performance with 18 FPI; ensure fittings and tubing match the loop’s diameter to reduce flow restriction. Regularly inspect for corrosion or debris and perform periodic coolant changes according to your loop maintenance schedule.