Specifications:
The document describes a series of double inlet fans with forward curved blades, designed for both single-phase (230V 1~ 50Hz) and three-phase (400V 3~ 50Hz) power supplies. The maximum air flow volume for single-phase is 6800 m³/h, while for three-phase it is 16900 m³/h. These fans are noted for being compact and super silent.

Models and Performance:
Various models are listed, including D270/EM1, D340/EM1, D440/EM15, and others, each with specific performance characteristics. The document includes performance graphs showing the relationship between air flow volume (m³/h) and static pressure (Pa) for different models.

Graph Analysis:
The graphs illustrate how different models perform under varying conditions of air flow and static pressure. For instance, models like DS6-740/EM35 and D770/EM850 are plotted to show their efficiency in terms of air flow volume against static pressure.

Key Parameters:
- Voltage: 230V 1~ 50Hz and 400V 3~ 50Hz
- Maximum Air Flow: 6800 m³/h (single-phase), 16900 m³/h (three-phase)
- Features: Compact, super silent

Recommendations:
The document suggests selecting models based on specific air flow and pressure requirements, ensuring optimal performance and efficiency.