In modern industrial and commercial HVAC (Heating, Ventilation, and Air Conditioning) sectors, high-efficiency air handling systems are the cornerstone of safe operations and equipment longevity. For industrial applications that require overcoming high resistance, navigating long-distance ductwork, or managing high-volume air exchange, a stable fan system capable of delivering both High Static Pressure and High Airflow is crucial.
Ningbo Longwell Electric Technology Co., Ltd. (LONGWELL, Official Website: www.longwellfans.com), a specialized HVAC fan manufacturer, presents this professional centrifugal fan selection guide to help you easily match the ideal LONGWELL product series to your high static pressure and high airflow needs.
Why Centrifugal Fans are Essential for High-Pressure Industrial Applications
In high-resistance systems (such as complex duct networks, high-efficiency filter banks, heat exchangers, etc.), fans must possess substantial static pressure capabilities to effectively move air to the designated area.
Unlike axial fans, which primarily rely on speed to generate flow, the unique impeller structure and housing design of Centrifugal Fans allow them to efficiently convert the kinetic energy of the airflow into static pressure. This mechanism enables centrifugal fans to maintain stable airflow even when encountering high system resistance, making them the ideal choice for solving both High Static Pressure and High Airflow requirements.
Key Technical Difference: Backward Curved vs. Forward Curved Blades
LONGWELL offers two major centrifugal fan aerodynamic designs to cater to different operational priorities:
Blade Type | Typical Series | Performance Focus | Key Advantage | Typical Application |
Backward Curved | LWBE (EC) | High Static Pressure, High Efficiency | Highest aerodynamic efficiency, non-overloading characteristic, ideal for high resistance | Clean Rooms, High-Efficiency Filtration Systems, Variable Air Volume (VAV) Systems |
Forward Curved | LWFA (AC/EC), DD | Maximum Airflow Volume | Compact size, high airflow at lower RPM, cost-effective | General Ventilation/Exhaust, Low-resistance Air Handling Units (AHU) |
For applications demanding extreme static pressure and precise control, such as cleanrooms in the semiconductor or pharmaceutical industries, Backward Curved Centrifugal Fans (like the LONGWELL LWBE series) deliver a steeper Pressure-Flow (P-Q) curve. This ensures minimal airflow fluctuation even as system resistance changes. For instance, specific models in our LWBE series can achieve a static pressure of 473 Pa while delivering an airflow of 5220m3/h.
LONGWELL Centrifugal Fan Selection: AC vs. EC Technology
In the industrial fan sector, drive technology is the core factor determining energy efficiency and control precision. LONGWELL offers two dominant technologies, EC (Electronically Commutated) and AC (Alternating Current), to address varying industrial requirements and TCO (Total Cost of Ownership) considerations.
EC Technology: High Efficiency, Intelligence, and Precision Control (LWBE Series)
EC (Electronically Commutated) fans represent the future trend in industrial ventilation. They integrate high-performance brushless DC motors with smart electronic control modules, offering revolutionary energy savings and control advantages:
- Superior Energy Efficiency, Reduced TCO:EC fans boast efficiency significantly higher than traditional AC motors, leading to substantial reductions in operational electricity costs. For industrial equipment running continuously year-round, the initial investment is quickly recovered through energy savings, resulting in a lower TCO.
- Precision VAV (Variable Air Volume):EC fans support 0-10VDC/PWMsignal stepless speed control, enabling seamless integration with Building Management Systems (BMS) or industrial automation platforms. Airflow is precisely adjusted based on real-time demand, eliminating unnecessary energy waste.
- Performance Range:Maximum airflow can reach 5000 CFM, perfectly covering high-efficiency, high static pressure complex industrial environments.
AC Technology: Robust Power and Heavy-Duty Durability (LWFA Series)
AC (Alternating Current) centrifugal fans are the conventional workhorse of industrial applications, particularly suited for heavy-duty environments where airflow and durability are paramount, and energy efficiency requirements are less stringent.
- Maximum Airflow Output:LONGWELL’s AC centrifugal fan series can deliver airflow up to 8000 CFM, suitable for heavy industry sites requiring rapid air exchange or heat dissipation.
- Simple Structure, Easy Maintenance:AC technology is mature, robustly constructed, and ideal for enduring high temperatures and extreme operating environments.
- Application Scenarios:Forced ventilation of heavy machinery, high-temperature exhaust, and projects sensitive to initial procurement costs.
LONGWELL Technology | Max Airflow (CFM) | Noise Range (dB) | Control Capability | Key Advantage for Applications |
EC Centrifugal | Up to 5000 | 50-55 (Low Noise) | 0-10VDC/PWM Precision Speed Control | High static pressure, high efficiency, VAV required |
AC Centrifugal | Up to 8000 | 55-65 (Medium to High Noise) | Single Speed or Simple Speed Control | Maximum airflow, heavy-duty, cost-effective |
3. Practical Selection Advice: How to Match Your Fan Precisely
Successful fan selection is about precisely matching the fan’s performance to your system’s requirements, not simply aiming for the maximum specifications.
- Determine Total Airflow (CFM/m3/h):Establish the required air volume based on the necessary Air Changes Per Hour (ACH).
- Precisely Calculate System Static Pressure (Pa): This is the core of high-pressure selection. Sum up all resistance sources—duct length, bends, valves, heat exchangers, and especially high-efficiency filters (HEPA)—to determine the system’s total static pressure requirement.
- Technology Decision:
- Prioritize Efficiency and VAV? Choose the EC Backward Curved (LWBE) series.
- Prioritize Maximum Airflow and Cost-Effectiveness? Consider the AC Forward Curved (LWFA) series.
- Reserve a Safety Margin: Given that filters clog over time and duct systems degrade, it is recommended to reserve a 10-15% static pressure safety margin in your final selection to ensure the system remains stable over the long term.
Conclusion: LONGWELL—Your Trusted HVAC Expert Partner
LONGWELL (Ningbo Longwell Electric Technology Co., Ltd.) is committed to being your reliable partner in industrial ventilation systems. We understand the stringent demands of industrial clients regarding fan performance, efficiency, and reliability.
Whether your project requires the maximum airflow of the LWFA AC series for heavy-duty, high-temperature environments, or the superior static pressure and intelligent control of the LWBE EC series for precision cleanroom applications, LONGWELL provides compliant and optimized solutions. Our product philosophy is simple: to find the optimal balance between performance, efficiency, and reliability for you.
Contact Us Today!
Visit www.longwellfans.com, or send your project requirements to sales@zjlongwell.com. The LONGWELL professional team will provide you with detailed product catalogs, personalized performance curve analyses, and expert selection consulting services.
