Description
External Rotor Centrifugal Fan
Energy-saving and easy to install. Engineered for high static pressure ventilation, air extraction, and dust control across buildings, hotels, labs, factories, and ships.
Why Choose the LWERQ Series
Ruggedly constructed with heavy-duty carbon steel housings and high-efficiency external rotor drives for rigorous industrial use.
Thickened Carbon Steel Casing
Spray-painted and wear-resistant enclosure built for shockproof, drop-proof, and lasting corrosion resistance.
Forward Curved Impeller
Optimized blade geometry delivers strong airflow and high static pressure with low operating turbulence.
All-Copper Motor
Thickened copper windings ensure low temperature rise, high electrical efficiency, and 24/7 continuous durability.
Secure Mounting Base
Integrated mounting base keeps the blower firmly anchored for stable operation in fixed installations.
Product Specifications
Comprehensive performance parameters, inlet/outlet sizing, and overall dimensions for LWERQ series models (1.5A to 4A).
| Model | Voltage (V) | Power (W) | Speed (r/min) | Air Volume (m³/h) | Total Pressure (Pa) | Noise dB(A) |
|---|---|---|---|---|---|---|
| LWERQ-1.5A-0.24-2P-1-001 | 220 | 240 | 2650 | 630 | 480 | 70 |
| LWERQ-1.5A-0.24-2P-3-002 | 380 | 240 | 2650 | 630 | 480 | 70 |
| LWERQ-2A-0.235-4P-1-001 | 220 | 235 | 1450 | 1380 | 400 | 62 |
| LWERQ-2A-0.22-4P-3-002 | 380 | 220 | 1450 | 1380 | 400 | 62 |
| LWERQ-2.5A-0.48-4P-1-001 | 220 | 480 | 1450 | 2100 | 490 | 65 |
| LWERQ-2.5A-0.385-4P-3-002 | 380 | 385 | 1450 | 2100 | 490 | 65 |
| LWERQ-3A-0.83-4P-1-001 | 220 | 830 | 1450 | 3050 | 600 | 68 |
| LWERQ-3A-0.9-4P-3-002 | 380 | 900 | 1450 | 3050 | 600 | 68 |
| LWERQ-3.5A-1.8-4P-3-001 | 380 | 1800 | 1480 | 4900 | 800 | 75 |
| LWERQ-4A-1.8-6P-3-001 | 380 | 1800 | 960 | 6200 | 580 | 70 |
| Model | Φ1 | Φ2 | Φ3 | N1-D1 | A1 | A2 | A3 | B1 | B2 | B3 | N2-D2 | A | B | C | D | E | F | G | H | I | J | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LWERQ-1.5A | Φ160 | Φ140 | Φ116 | 6-Φ7 | 135 | 107 | 71 | 170 | 142 | 106 | 4-Φ8 | 301 | 250 | 190 | 116 | 184 | 88 | 4-Φ8 | 185 | 139 | 16 | 8 |
| LWERQ-2A | Φ195 | Φ175 | Φ150 | 6-Φ7 | 202 | 174 | 138 | 183 | 155 | 119 | 8-Φ8 | 389 | 321 | 223 | 135 | 245 | 119 | 4-Φ11 | 220 | 164 | 16 | 11.25 |
| LWERQ-2.5A | Φ230 | Φ205 | Φ180 | 8-Φ7 | 272 | 244 | 208 | 183 | 155 | 199 | 8-Φ8 | 478 | 413 | 223 | 135 | 292 | 150 | 4-Φ11 | 270 | 204 | 16 | 17.55 |
| LWERQ-3A | Φ284 | Φ260 | Φ232 | 8-Φ7 | 290 | 262 | 226 | 183 | 155 | 119 | 12-Φ8 | 569 | 485 | 268 | 135 | 346 | 161 | 4-Φ11 | 310 | 234 | 16 | 27 |
| LWERQ-3.5A | Φ355 | Φ320 | Φ280 | 8-Φ10 | 307 | 277 | 247 | 309 | 279 | 249 | 20-Φ7 | 672 | 542 | 395 | 249 | 410 | 182 | 4-Φ12 | 400 | 260 | 30 | 45 |
| LWERQ-4A | Φ395 | Φ355 | Φ315 | 8-Φ10 | 343 | 313 | 283 | 309 | 279 | 249 | 14-Φ8.5 | 764 | 618 | 427 | 250 | 460 | 200 | 4-Φ12 | 450 | 350 | 30 | 50 |
Thickened Carbon Steel Casing
Constructed with high-grade carbon steel featuring fine spray-painting, providing wear resistance, corrosion protection, and robust structural reinforcement.
Engineered to be shockproof and drop-proof, guaranteeing lasting reliability and maximum safety in demanding industrial environments.
- Heavy-gauge carbon steel — exceptional rigidity and durability
- Spray-painted coating — advanced corrosion and wear resistance
- Rigid casing design — shockproof structure for harsh plant conditions
Forward Curved Impeller
The optimized blade arrangement efficiently converts motor power into stable airflow and strong air pressure, minimizing turbulence and energy loss.
Engineered for low static pressure and high airflow output, delivering quiet and reliable ventilation performance.
- Optimized blade geometry — maximizes air delivery efficiency
- Low static pressure profile — high volume output with reduced loss
- Precision dynamic balancing — smooth and quiet rotation
All-Copper Motor
Thickened copper-core wires guarantee low temperature rise, high efficiency, and long-lasting operation, producing ultra-strong airflow under continuous duty.
Features a compact external rotor structure for superior heat dissipation and efficient direct drive.
- Thickened copper windings — superior electrical conductivity and lifespan
- Low operating temperature — ideal for 24/7 continuous industrial use
- Efficient drive architecture — compact structure with high output
Large Air Outlet Design
The wide rectangular outlet enables smoother air discharge, reduces airflow resistance, and supports stable ventilation while allowing easy connection to air ducts.
Engineered to integrate seamlessly into ducting networks and ventilation layouts with minimal pressure drop.
- Wide rectangular discharge — lowers exit velocity pressure loss
- Easy duct connection — fits standard ducting flanges securely
- Smooth airflow discharge — maintains uniform velocity profile
Low Noise & Stable Operation
The optimized fan structure helps reduce vibration and operating noise, making it suitable for continuous ventilation in workshops, warehouses, and equipment rooms.
Rigid casing architecture and precision balancing ensure steady, low-vibration performance under 24/7 duty cycles.
- Optimized internal structure — minimizes aerodynamic vibration
- Lower vibration — steady performance in sensitive environments
- Continuous ventilation — dependable operation in commercial spaces
Powerful Airflow Performance
The centrifugal airflow design delivers strong and concentrated air output, helping improve ventilation efficiency in commercial and industrial systems.
Directed discharge capabilities ensure rapid air exchange and effective extraction over extended duct runs.
- Strong airflow output — high volume delivery across systems
- Directed discharge — focused air jet for high-efficiency extraction
- System optimization — boosts overall ventilation effectiveness
Secure Mounting Base
The integrated mounting base helps keep the blower firmly positioned for stable operation in fixed equipment installations.
Engineered with pre-drilled bolt slots for fast, secure anchoring onto floors, shelves, or structural equipment frames.
- Integrated mounting base — rigid foundation for fixed setups
- Firm positioning — prevents shifting or vibration rattle under load
- Easy connection — simplifies installation in tight equipment spaces
Wide Industrial Applications
Designed for reliable ventilation and dust control across buildings, hotels, labs, factories, and ships.
Air Handling Units
Seamless integration into centralized AHU systems for commercial buildings.
Commercial & Public Buildings
Reliable ventilation and air extraction for hotels, offices, and halls.
Ducted Ventilation Systems
High static pressure air delivery across extended building duct runs.
Factory Workshops
Continuous air exchange and dust control in manufacturing plants.
HVAC Systems
Core air movement and climate control for modern HVAC installations.
Industrial Equipment Cooling
Targeted heat dissipation for heavy industrial machinery and equipment.
Ventilation & Air Purification
Pushes airflow through multi-stage filtration and scrubbing units.
Warehouses & Logistics Centers
Large-scale air circulation across massive storage facilities.
LONGWELL — Trusted Industrial Fan Manufacturer Since 1990
Founded in 1990 in Yuyao, Ningbo — the heart of China’s advanced manufacturing belt — LONGWELL has grown from a precision fan component workshop into a vertically integrated ventilation technology group. Today we engineer AC, DC and EC fan and motor systems with 4,000 m²+ of manufacturing floor, dedicated aerodynamics and CFD simulation labs, and a global export network spanning Europe, the Americas and Asia-Pacific.
From material selection to final balancing, every LONGWELL fan is built on automated lines, computer-balanced impellers and 100% run-test before shipment. We are certified to ISO 9001:2015 and ISO 14001, with CE, UL/ETL, RoHS and EAC compliance, and performance tested to the AMCA 210/211 method.
Production & Delivery
Automated lines, computer-balanced impellers and 100% run-test ensure every LWERQ fan ships ready for installation.
Global Market & Client Preference
LWERQ series is the preferred centrifugal fan for HVAC distributors, equipment manufacturers and OEM clients across Europe, the Middle East, Southeast Asia, and South America.
Trusted by Leading Global HVAC Brands
24+ HVAC OEMs and equipment builders rely on LONGWELL for industrial centrifugal fans every year.
Complete Range of Professional & Certified
LONGWELL fans are independently certified to international quality, safety and energy-efficiency standards.
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View Product →Frequently Asked Questions
Quick technical answers regarding the LWERQ series centrifugal fan.
What are the main structural features of the LWERQ centrifugal fan?
The LWERQ series is built with a thickened carbon steel casing with anti-corrosion spray painting, an optimized forward-curved impeller, and a high-efficiency all-copper external rotor motor for stable and rugged industrial operation.
What voltage and power configurations are available?
The LWERQ series provides flexible 220V single-phase and 380V three-phase options, covering power ratings from 220W up to 1800W across frame sizes from 1.5A to 4A.
What is the maximum airflow and static pressure of the LWERQ series?
Airflow ranges from 630 m³/h up to 6,200 m³/h, and total static pressure reaches up to 800 Pa depending on the specific model and operating speed.
Where is the LWERQ series typically installed?
It is widely used for ventilation and dust control in commercial buildings, hotels, research laboratories, manufacturing factories, and marine ships.
How does the thickened carbon steel housing enhance durability?
The heavy-gauge carbon steel casing features fine spray-painting finish that resists wear and corrosion, providing superior structural rigidity and shockproof protection in harsh environments.
Does LONGWELL offer custom mounting or electrical specifications?
Yes. LONGWELL provides full OEM/ODM support including custom mounting base dimensions, special cable wiring harnesses, flange configurations, and private label branding.
Need a Quote or Custom Specs?
Tell us your airflow, static pressure, and installation requirements — our engineers will size the right LWERQ model and quote within 24 hours.
