We manufacture EC plug fans with backward-curved impellers from 133mm to 630mm. Engineered with integrated EC external-rotor motors, belt-free direct drive and 0-10V/PWM speed control, delivering quiet, space-saving static pressure for AHUs, fan wall arrays, data center CRAH units, and cleanroom ventilation.
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Unlike traditional centrifugal fans and chassis fans, the plug fan's compact design allows it to be directly integrated into the system's static pressure box, saving up to 26% of space.
The plug fan adopts reverse impeller, which reduces the resistance of air flow, improves the energy conversion efficiency, and enables the fan to achieve high static pressure efficiency.
Plug fan can be equipped with insulation plates and shaft seals, which can not only be used in clean air-conditioning boxes, but also adapt to high temperature or polluted environments.
When the plug fan needs maintenance, you can quickly pull out the entire fan module from the equipment housing without having to remove large amounts of piping or equipment around it.
The plug fan removes volute, eliminating this major source of noise at its root. Moreover, its backward-flow impeller allows for more stable and uniform airflow, reducing aerodynamic noise.
The plug fan is generally connected directly to the motor, which greatly eliminates the energy loss of the belt and maintenance costs. The average efficiency of its EC motor is more than 90%.
Plug fan is a special type of centrifugal fan with backward-tilted blades and no volute. When choosing between plug fan and conventional centrifugal fan, you might be wondering: “Which one should I pick?” Then keep reading to find out.
The plug fan has compact structure and requires less installation space. The absence of volute allows you to freely determine the airflow direction and is easy to clean. It is often used in static pressure boxes and modular AHUs.
The inlet and outlet direction of centrifugal fan is fixed, it needs more space to install, maintenance is a little more complex than plug fan. However, its static pressure capacity is higher, suitable for industrial ventilation, HVAC system, exhaust system, etc.
Longwell plug fan uses EC motor, which saves more than 35% energy compared to traditional AC fans and greatly reduces electricity costs. Its belt-free design avoids transmission wear and tear, improving service life. The ball bearings we use can last up to 100,000 hours without frequent replacement.
From motor winding and impeller dynamics optimization to complete unit assembly, Longwell integrates a vertical supply chain to ensure that each fan is dynamically balanced, efficiency verified and 100% performance tested to ensure high quality and performance.
Longwell produces more than a million turbines per year and can deliver them quickly. Even for large orders, we can deliver them within 3-5 weeks.
LONGWELL EC plug fans in fresh air handling units, data center cooling and laboratory equipment — reviewed by the engineers and project managers who specified them.
| Background | Fresh air handling units in a commercial ventilation system; LONGWELL plug fans installed directly in the AHU air section. |
|---|---|
| Products | EC plug fan with a backward-curved centrifugal impeller, mounted without a volute or separate scroll housing. |
| Key Requirement | Robust static pressure efficiency and consistent airflow across the full operating range of the unit. |
| Motor & Control | Direct-drive EC motor with rapid speed response and energy-efficient operation. |
| Operating Period | Six months of continuous operation at the time of the review. |
| Serviceability | The complete fan module withdraws from the equipment housing without removing the surrounding ductwork. |
“This plug fan delivers exceptional compatibility with our fresh air handling units. Its backward-curved centrifugal impeller ensures robust static pressure efficiency and consistent airflow performance. The EC motor features rapid speed response and energy-efficient operation. Over the past six months of operation, we've experienced excellent noise control with hassle-free maintenance. We are thoroughly satisfied and would like to establish a long-term partnership with Longwell.” — David Chen, Mechanical Engineer
| Background | Latest data center cooling project; plug fans installed in the cooling air path to remove heat continuously. |
|---|---|
| Products | LONGWELL EC plug fans with all-metal construction and direct-drive motors. |
| Operating Condition | Sustained heavy loads in continuous duty, where unplanned downtime is not acceptable. |
| Key Requirement | Low noise under load, mechanical durability and stable, reliable operation. |
| Integration | Compact housing-free design mounts directly into the cooling unit, saving space in the fan section. |
| Reviewer Focus | Component-level reliability in a precision-controlled environment. |
“We implemented the plug fans in our latest data center cooling project, and their performance has been truly impressive. The metal construction delivers exceptional durability while maintaining low noise levels under heavy loads. This reliable and efficient component gives me complete peace of mind.” — Sarah Müller, Project Manager
| Background | Cooling for test equipment chassis in an R&D laboratory, where measurement work runs alongside the equipment. |
|---|---|
| Products | LONGWELL EC plug fans with speed-adjustable control, supplied from the LONGWELL factory in China. |
| Key Requirement | Quiet, dependable cooling and precise airflow control inside a compact chassis. |
| Control | Fan speed adjusted to match the heat load of the test equipment rather than running at a fixed duty point. |
| Noise Design | The volute-free design removes a major noise source; stable, uniform airflow reduces aerodynamic noise. |
| Integration | Plug-in mounting with no scroll housing, allowing the fan to sit directly in the chassis air path. |
“When seeking a quiet and reliable cooling solution for the test equipment chassis, we identified Longwell's factory located in China. I can confidently say that choosing Longwell EC plug fans was an excellent decision. Their seamless integration and speed-adjustable features allow precise airflow control, while their low-noise characteristics perfectly match the laboratory environment.” — Chloe Davis, Head of R&D Laboratory
Plug fans are ideal for central air systems in large buildings like commercial offices, hospitals, and schools. Because they can be integrated directly into the AHU without a housing, they offer a very compact design and flexible discharge direction. This high-efficiency, energy-saving solution provides the necessary power to move air throughout the entire system.
Data centers require constant, efficient heat removal, making high-efficiency EC plug fans the go-to choice. Often, multiple fans are arranged in a "fan wall" for redundancy and improved performance. This setup not only cuts down on persistent low-frequency noise but also guarantees stable operation in these precision-controlled environments.
Longwell plug fans can be integrated into a variety of industrial systems, including fume hoods, dust collection systems, and ductwork. They provide comprehensive ventilation for factory workshops, commercial kitchens, printing facilities, and other similar spaces. By effectively removing airborne dust and hot air, they help create a healthier working environment.
The compact, easy-to-seal design of plug fans is perfect for environments that require strict cleanliness standards, such as those meeting ISO Class 5. Their modular construction simplifies routine inspections, cleaning, and filter replacements. Plus, they offer remarkable energy savings compared to traditional AC motors.
Ventilation systems in subways, high-speed trains, and other vehicles demand fans that are small, lightweight, and highly reliable. Plug fans are a great choice because their rugged design can withstand the impacts of vehicle movement, ensuring long-term stable performance. Their low operating noise also helps improve passenger comfort.
Built with heat-resistant materials and specialized cooling features, plug fans can handle gases up to 650°C. This makes them perfect for high-temperature environments like ovens, dryers, and kilns. With optional explosion-proof and corrosion-resistant features, they deliver exceptional safety and durability, making them an ideal fit for drying systems in the paper industry.
√ Beltless design: This eliminates the tedious task of regular belt replacement, tensioning, and lubricating bearings, as well as the efficiency losses caused by belt slippage.
√ Modular design: When the fan needs cleaning, inspection, or replacement, the entire fan module can be easily removed from the side of the unit, significantly reducing downtime.
√ Easy to Clean: The simple structure makes cleaning the impeller and interior of the housing easier, facilitating the maintenance of high cleanroom standards.
√ Airflow and Static Pressure Requirements: Based on the system’s required airflow and the required resistance, review the fan’s performance curve (P-Q curve) to ensure the operating point is within the high-efficiency range.
√ Installation Space Constraints: Confirm the size of the equipment’s static pressure box to ensure sufficient space for smooth airflow into the fan to avoid performance loss.
√ Environment and Media Characteristics: Does your application involve high temperatures, corrosive gases, or explosive environments? It’s best to select the appropriate material, ingress protection rating, and certification based on the environmental requirements.
Product certificates cover only the models listed on each document — ask which ones apply to your model. ISO certificates cover management systems, not products. Declaration of Conformity for your model and destination on request.
All document scans and what each coversSpecified and drawn by LONGWELL, built to our drawings by qualified partner factories, inspected and released to LONGWELL standards.
