Optimize your AIO cooling/ flow/ noise profile. See our other listings for more spacer/ reducer solutions.

PC fan reducer/ flow optimizer. Intended to reduce the flow of (3) 140mm fans down to a 120x360mm radiator. Can be used in push and/ or pull configurations. The thicker the adapter, the more efficient the airflow will be.

Custom sizing available upon request.

Custom colors available upon request. Custom colors may increase handling time depending upon availability.


Brand: FMC
Model: FR-Series


FMC fan reducers are optimized to improve flow efficiency by:

1) Increasing effective radiator flow area (sometimes by ~30% depending on your radiator design).

2) Reducing fan blade boundary layer interaction with nearby obstructions (radiator fins, mesh panels, case perforations, etc).

3) Reducing chamber recirculation (in push configurations).


Why (3) 140mm fans instead of the standard (3) 120mm fans?

1) Most radiator designs mount fans directly/ very close to the radiator fins, which results in airflow voids near the fan hubs that reduce the effective surface area of the radiator. Fan reducers help improve thermal performance by permitting airflow to the entire radiator surface area.

2) 140mm fans generally run at a lower RPM than 120mm fans, and tend to have more efficient performance per dB. All 140mm designs are tested with Arctic P14 Max fans, and as such are recommended for use with our products (fans not included with listing).

3) (3) 140mm fans are a good compromise over (3) 120mm fans because they allow you to improve airflow/ fully utilize the thermal capacity of your radiator, but without requiring noisy high-RPM fans to do so.


Listing includes:
- (1)   2-piece black plastic fan reducer.
- (3)   Optional-use vortex inserts
- (8)   Radiator Screws, 6-32 x 1/4" L. Screw threads will engage your radiator threads by ~3.5mm.
- (8)   Fan Screws, 6-32. Length varies with specified fan thickness (fans not included with listing).

Components are FDM 3D printed and postprocessed, but may still exhibit cosmetic characteristics of that manufacturing process (layer lines, nozzle marks, stringing, etc). Please ensure total thickness (fan thickness + spacer thickness) will work with your specific equipment.