Specifications:
The document provides detailed specifications for a range of axial fans (AXF series) designed for marine applications, particularly in engine rooms of yachts and mega yachts. The specifications include dimensions, weight, and material composition for each fan model. Key dimensions are given in terms of internal and external diameters, depth, and weight.

Fan Models and Dimensions:
- AXF 215/A DC: ØInt. 215 mm, ØExt. 275 mm, Depth 290 mm, Weight 10 kg
- AXF 250/B DC: ØInt. 260 mm, ØExt. 320 mm, Depth 150 mm, Weight 13 kg
- AXF 315/A AC: ØInt. 310 mm, ØExt. 390 mm, Depth 150 mm, Weight 12 kg
- Additional models follow a similar format with varying dimensions and weights.

Background and Usage:
These fans are characterized by high flow volume and durability, making them suitable for engine rooms in yachts and mega yachts. It is essential to specify the orientation of the fan's airflow when ordering. The fans are equipped with a protection grid on the motor side and can be supplied with vibration damping rings upon request.

Materials:
- Casing: Painted steel
- Impeller: Aluminum alloy and polypropylene-glass

Performance and Electrical Specifications:
The document lists performance metrics such as voltage, maximum delivery (m³/min), maximum pressure (mm H2O), and power (kW) for each fan model. For example:
- AXF 215/A DC: Voltage 12-24 V, Max Delivery 22 m³/min, Max Pressure 13 mm H2O, Power 0.18 kW
- AXF 250/B AC: Voltage 1~230 - 3~230/400 V, Max Delivery 35 m³/min, Max Pressure 13 mm H2O, Power 0.37 kW
- Higher models have increased delivery, pressure, and power requirements.

Conclusion:
The AXF series fans are designed for high performance in marine environments, offering robust construction and efficient airflow management. They are suitable for enhancing the performance of engine rooms in marine vessels.