The RREF5 133x42R - Y39-A5 fan and its UL 120V version: RREuF5 133x42R - Z43-A2 is a model that was added to our range of ECOFIT centrifugal backward fans in 2025. It is designed to meet the needs of demanding technical environments: its protection level is IP54. 
This centrifugal backward fan stands out for: 

• its compact size, 
• its high efficiency, thanks in particular to the integration of EC technology (electronic commutation) 

Compactness

With a diameter of only 133 mm, it is the smallest backward fan in our catalog, while offering a high level of performance for its small size. Its compactness is a key advantage: the fan can be integrated into systems where space is a major constraint, without compromising on pressure or reliability. 

High efficiency

Thanks to a backward-curved impeller, characteristic of centrifugal backward fans, the 133x42R model maintains high pressure and offers low noise levels, ideal for improving our living spaces. 
The integration of the EC F5 motor is one of the main advantages of this new model. EC technology allows it to combine power and energy efficiency. EC motors combine the advantages of brushless motors and electronic control, resulting in:

• significantly reduced power consumption compared to standard AC motors;
• excellent efficiency, even at partial speed;
• increased longevity, thanks to minimal mechanical wear;
• simple and precise speed control, optimizing air flow according to the actual needs of the application.

Its areas of application

The compact design of our RREF5 133x42R fan allows it to be integrated into a wide range of different applications in industry, embedded electronics, technical cabinets, and thermal devices requiring regular and efficient air circulation.
Its EC F5 motor also allows it to be integrated into modern systems seeking to reduce their energy impact while maintaining a high level of performance.
For example, it is suitable for HVAC systems, electronic cooling units, compact industrial equipment, and devices requiring precise ventilation in a small space.

Your project

Do you have a project in the pipeline and need help finding a ventilation or cooling solution? Feel free to contact us as early as the design phase. Our sales and R&D departments will guide you in your choices or develop a solution specifically tailored to the needs of your application.