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繁體中文How to Select ebm-papst EC Fans for Air Handling Units (AHU)
12/26/2025Selecting the right fan is one of the most critical steps in AHU design, as improper selection can lead to inefficient airflow, excessive noise, and increased energy costs even with high-quality components. ebm-papst EC fans are widely specified for AHU systems due to their high efficiency, precise speed control, and long-term reliability, but full utilization of EC technology requires correct selection based on real system requirements. This guide provides HVAC engineers and project managers with a practical, step-by-step process for choosing ebm-papst EC fans for AHU applications.
The starting point for AHU fan selection is defining system demand, specifically required airflow (m³/h or CFM) and total external static pressure (Pa or in. wg). These values are determined by ductwork design, filters, heat exchangers, dampers, and silencers, and ebm-papst EC centrifugal fans are particularly suitable for medium to high static pressure AHU systems that need stable airflow under varying load conditions.
Next, choose the appropriate fan type for the AHU: most modern AHUs use backward-curved EC centrifugal fans, preferred for their stable airflow across a wide operating range, high efficiency at partial load, compact integration into AHU casings, and excellent compatibility with variable air volume (VAV) systems. For modular AHUs with limited space, custom airflow direction needs, or important maintenance access requirements, ebm-papst EC plug fans are an ideal choice, commonly used in custom-built and modular designs.
Before finalizing the fan model, verify installation space and mechanical design details, including available installation dimensions, inlet and outlet clearances, mounting method (base frame or bracket), and service access for maintenance. Proper installation directly impacts fan efficiency, noise levels, and service life, as incorrect spacing or airflow obstruction can reduce overall AHU performance even with high-quality EC fans.
A major advantage of ebm-papst EC fans is their integrated control electronics, with common control options including 0–10V analog control, PWM signal, Modbus or BACnet integration, and feedback signals for speed and status monitoring. When selecting an EC fan, confirm compatibility with the building’s Building Management Systems (BMS), PLC, or HVAC controllers to ensure seamless operation and simplified commissioning.
Many HVAC projects in Europe, North America, and the Middle East are subject to strict energy regulations, and EC fans help meet these requirements by reducing power consumption at partial load, improving system-level efficiency, and supporting energy-saving retrofit projects. For AHU manufacturers and system integrators, EC fan selection is often a key factor in achieving project energy targets.
AHU fans often operate continuously in demanding conditions, so it’s important to consider factors such as ambient temperature, air humidity, continuous or intermittent operation, and indoor or outdoor AHU installation. ebm-papst EC fans are designed for long service life and stable operation, making them suitable for critical HVAC applications like hospitals, data centers, and commercial buildings.
To avoid common selection mistakes, refrain from choosing airflow without considering static pressure, ignoring part-load operating conditions, underestimating control and communication requirements, failing to plan for maintenance access, or selecting fan size based solely on nominal data. Proper selection prevents performance issues and reduces long-term operating costs.
In AHU retrofit projects, replacing AC fans with ebm-papst EC fans offers improved energy efficiency, better airflow control, easier integration with modern HVAC controls, and reduced maintenance requirements. Many existing AHUs can be upgraded without major mechanical modifications when the correct EC fan is selected.
Working with APAC FAN for AHU fan selection provides engineering-based support, including fan selection based on real operating points, assistance with new AHU designs and retrofit projects, experience across HVAC, data centers, and industrial ventilation, and supply support for worldwide markets. Choosing the right EC fan is critical to AHU performance and system efficiency, and our team can help select the most suitable ebm-papst EC fan for your AHU application.
