Customer Requirement
An OEM customer needed two AC axial fans installed inside a duct. They selected LONGWELL’s LWAA4E250S-5MEB-32 and LWAA4E300S-5MEB-15 models as the benchmark models. The customer requested to modify the housing of each axial flow fan. This was because the barrel-shaped structure is more suitable for integration into their equipment.
Both sizes had to operate on a fixed 220VAC, 50 Hz power supply and maintain the original airflow output. Components used in the design needed to meet relevant European safety requirements, including EN 60335-1. IPX4 protection was specified for the finished fan assembly.
Engineering Solution
This project was classified as a light development project. The existing 250 mm and 300 mm axial fans already provided the required performance. The main requirement of this project is to meet customers’ integration needs.
LONGWELL designed and adjusted a cylindrical housing for each fan size. We used cold-rolled steel to match the existing fan structure. The housing structure and component arrangement were checked against the customer’s IPX4 requirement. The two configurations were released as LWAA4E250S-5MYB-32-00 and LWAA4E300S-5MYB-15-00.
Technical Specifications
Model: LWAA4E250S-5MYB-32-00
| Parameter | Value |
|---|---|
| Nominal Voltage | 220 VAC |
| Frequency | 50 Hz |
| Speed | 1450 RPM |
| Input Power | 55 W |
| Current | 0.23 A |
| Max Airflow | 906 m³/h / 533 CFM |
| Noise Level (LpA) | 55 dB(A) |
| Capacitor | 2 µF |
| Operating Temperature | -30°C to +60°C |
| Insulation Class | Class F |
| Protection Class | IP54 |
| Life Expectancy (L10) | 30,000 Hours @ 40°C |
| Dimensions | Ø280 mm x 173 mm (D) |
Model: LWAA4E300S-5MYB-15-00
| Parameter | Value |
|---|---|
| Nominal Voltage | 220 VAC |
| Frequency | 50 Hz |
| Speed | 1350 RPM |
| Input Power | 85 W |
| Current | 0.39 A |
| Max Airflow | 1906 m³/h / 1120 CFM |
| Noise Level | 60 dB(A) |
| Capacitor | 3 µF |
| Operating Temperature | -30°C to +60°C |
| Insulation Class | Class F |
| Protection Class | IP54 |
| Life Expectancy (L10) | 30,000 Hours @ 40°C |
| Dimensions | Ø358 mm x 214 mm (D) |
The specifications confirm two fan models optimized for 220V/50Hz systems, delivering significant airflow (906 m³/h and 1906 m³/h) in a durable, IP54-rated package suitable for demanding industrial and commercial HVAC environments.
Technical Documentation
Final Specification Sheet (LWAA4E250S-5MYB-32-00): This document provides the complete electrical and performance data for the 250mm tube axial fan model for system design and compliance.
Final Specification Sheet (LWAA4E300S-5MYB-15-00): This document contains all technical parameters for the 300mm tube axial model, required by engineers for integration.
Why LONGWELL for OEM Ventilation Integration?
- LONGWELL supplies axial fans in different sizes and configurations, from compact models for equipment cooling to larger units for duct and general ventilation. This gives OEM customers more room to match fan size and airflow to different equipment designs.
- Many axial fan series use external rotor motors. The motor and impeller are integrated into a relatively compact assembly, which is useful when installation depth is limited.
- Fan configuration can be adjusted around the application. Blade materials include plastic, aluminum, and steel, while guards, flanges, housings, and mounting details can be added according to the equipment interface.
- In this project, the existing 250 mm and 300 mm fan platforms were retained, while new housings were developed around the customer’s installation requirements.
Explore our full axial fans range.
Frequently Asked Questions
Q: What is the difference between the standard plate fan and this tube axial version?
A: The primary difference is the housing. The standard models are plate-mounted for surface installation, while these ‘MYB’ versions integrate the fan into a cylindrical steel casing with a depth of 173mm (for the 250mm model) or 214mm (for the 300mm model). This makes them suitable for in-line duct mounting and can improve static pressure generation by preventing air recirculation at the blade tips.
Q: What is the expected service life and operating temperature range?
A: The specified L10 life is 30,000 hours at an ambient temperature of 40°C. The fans can operate from −30°C to +60°C, covering the temperature range required for many commercial and industrial ventilation applications.
Q: Are these AC axial fans suitable for speed control?
A: These two models use single-phase AC motors and are normally operated at the rated 50 Hz supply. Limited speed adjustment may be possible with a compatible external VFD. If you need more precise speed control, using a LONGWELL SmartEC™ motor with intelligent control.
Technical Documentation & Resources
Project Gallery & Technical Drawings
Base models LWAA4E250S-5MEB-32 and LWAA4E300S-5MEB-15 modified into tube axial format.
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Longwell’s engineering team delivers custom spec sheets and samples within 90 days. Since 1990, we have supplied EC fans and blowers to OEMs across HVAC, cold chain, data center, and industrial applications worldwide.
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🏆 ISO 9001 / ISO 14001 / ISO 45001 | CE (TÜV) | UL/ETL | ATEX Zone 21/22 | AMCA 210-16 / ISO 5801 tested
Project Item: 7057976821-LWAA4E250S-5MEB-32 / LWAA4E300S-5MEB-15
Project Date: 2026-07-25 05:33:28
