Used condenser EC ventilators, brand ebmpapst type W3G800-GU23-7. Very suitable for various air cooled condensers/dry coolers.
Technical specifications:

• Ø800
• EC-motor
• 50/60 Hz
• 2.56 kW
• 3-380/480V
• 1020 RPM
• Die-cast aluminum with galvanized housing, painted black
• 230 Pa discharge head
• Number of blades: 5 (plastic)
• Direction of the blades: clockwise
• Degree of protection IP55
• Minimum/maximum operating temperature -40°C / +80°C
• Output 10 VDC, max 10 mA external 24V input