These 4 fans are Brushless DC Cooling Fan 7 Blade 24V 120mm x 120mmx25mm.
This type of fan is very silent and about the same width as the hot-water radiator. By joining 4 fans together, they cover almost the entire radiator length.
- 7 Plastic Blades
- Speed: 1600 RPM
- Airflow: 58 CFM
- Noise: 38 DBA
- Rating: DC 24V, 0.20A
These 4 fans were bought online for a total of 13.20€, plus 10.10€ for shipping.
The structural strength is given by the cable ties that pass through the holes in the corner of each fan, and join the fans together.