Description
High-Efficiency Energy-Saving Low-Noise Oil-Smoke Exhaust Fan
Engineered for strong pressure, stable airflow, and reliable exhaust performance in commercial kitchens and industrial ventilation systems.
Key Features at a Glance
Built for heavy-duty kitchen hood extraction, ducted exhaust lines, and continuous workshop ventilation.
Product Specifications
Performance parameters, outline drawings, and installation dimensions for the LWFDF11-66 series.
| Model | Power (kW·p) | Speed (r/min) | Air Volume (m³/h) | Total Pressure (Pa) |
|---|---|---|---|---|
| LWFDF11-66-2.5A-0.75-4P-1-001 | 0.75-4 | 1450 | 3360-4220 | 590-460 |
| LWFDF11-66-2.8A-1.5-4P-1-001 | 1.5-4 | 1450 | 5000-6200 | 740-560 |
| LWFDF11-66-3A-2.2-4P-1-001 | 2.2-4 | 1450 | 5700-7600 | 790-610 |
| LWFDF11-66-3.2A-3-4P-1-001 | 3-4 | 1450 | 6700-9700 | 870-710 |
| LWFDF11-66-3.5A-4-4P-1-001 | 4-4 | 1450 | 8160-11400 | 1100-840 |
| LWFDF11-66-4A-7.5-4P-1-001 | 7.5-4 | 1450 | 9400-14200 | 1440-1070 |
| LWFDF11-66-4A-3-6P-1-002 | 3-6 | 960 | 8600-10000 | 690-550 |
| LWFDF11-66-4.5A-11-4P-1-001 | 11-4 | 1450 | 12310-21600 | 1650-1200 |
| LWFDF11-66-4.5A-4-6P-1-002 | 4-6 | 960 | 11000-17600 | 890-790 |
| LWFDF11-66-5A-7.5-6P-1-001 | 7.5-6 | 960 | 13330-24500 | 1120-880 |
| LWFDF11-66-6A-15-6P-1-001 | 15-6 | 960 | 16600-27800 | 1570-1130 |
| Model | Motor Power | Φ1 | Φ2 | Φ3 | n1-d1 | A1 | A2 | A3 | a×x | B1 | B2 | B3 | b×y | n2-d2 | C1 | C2 | C3 | C4 | C5 | E | E1 | E2 | H | H1 | L | L1 | n3-d3 | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LWFDF11-66-2.5A | 0.75-4 | 200 | 225 | 250 | 6-Φ8 | 225 | 251 | 297 | 3×87.6 | 155 | 187 | 215 | 2×93.5 | 10-Φ8 | 215 | 255 | 360 | 40 | 440 | 473 | 279 | 172 | 300 | 467 | 533 | 150 | 4-Φ12 | 37.4 |
| LWFDF11-66-2.8A | 1.5-4 | 225 | 254 | 284 | 8-Φ8 | 300 | 332 | 360 | 3×100.7 | 170 | 205 | 230 | 2×102.5 | 10-Φ8 | 290 | 330 | 460 | 40 | 540 | 526 | 309 | 193 | 330 | 517 | 643 | 198 | 4-Φ14 | 56.5 |
| LWFDF11-66-3A | 2.2-4 | 250 | 280 | 310 | 8-Φ8 | 300 | 332 | 360 | 3×100.7 | 180 | 215 | 243 | 2×107.5 | 10-Φ8 | 290 | 330 | 485 | 40 | 565 | 558 | 327 | 207 | 380 | 580 | 680 | 203 | 4-Φ14 | 63 |
| LWFDF11-66-3.2A | 3-4 | 250 | 280 | 310 | 8-Φ8 | 310 | 342 | 370 | 3×114 | 194 | 229 | 257 | 2×114.5 | 10-Φ8 | 290 | 330 | 490 | 40 | 570 | 593 | 347 | 221 | 380 | 593 | 708 | 203 | 4-Φ14 | 68.8 |
| LWFDF11-66-3.5A | 4-4 | 280 | 320 | 355 | 8-Φ10 | 310 | 342 | 370 | 3×114 | 212 | 247 | 275 | 2×123 | 10-Φ8 | 290 | 330 | 490 | 40 | 570 | 647 | 378 | 241 | 422 | 654 | 719 | 213 | 4-Φ14 | 80 |
| LWFDF11-66-4A | 7.5-4 | 315 | 355 | 395 | 8-Φ10 | 340 | 372 | 400 | 3×124 | 242 | 277 | 305 | 2×138.5 | 10-Φ8 | 356 | 396 | 570 | 50 | 670 | 734 | 428 | 276 | 460 | 725 | 855 | 244 | 4-Φ14 | 141 |
| LWFDF11-66-4A | 3-6 | 315 | 355 | 395 | 8-Φ10 | 340 | 372 | 400 | 3×124 | 242 | 277 | 305 | 2×138.5 | 10-Φ8 | 356 | 396 | 570 | 50 | 670 | 734 | 428 | 276 | 460 | 725 | 815 | 244 | 4-Φ14 | 139 |
| LWFDF11-66-4.5A | 11-4 | 355 | 395 | 435 | 8-Φ10 | 340 | 372 | 400 | 3×124 | 272 | 307 | 335 | 3×153.5 | 10-Φ8 | 400 | 450 | 630 | 50 | 730 | 821 | 447 | 310 | 520 | 817 | 919 | 248 | 4-Φ14 | 203 |
| LWFDF11-66-4.5A | 4-6 | 355 | 395 | 435 | 8-Φ10 | 340 | 372 | 400 | 3×124 | 272 | 307 | 335 | 3×153.5 | 10-Φ8 | 366 | 416 | 570 | 50 | 670 | 821 | 447 | 310 | 520 | 817 | 859 | 248 | 4-Φ14 | 138 |
| LWFDF11-66-5A | 7.5-6 | 400 | 450 | 500 | 8-Φ12 | 340 | 372 | 400 | 3×124 | 302 | 337 | 365 | 2×68.5 | 10-Φ8 | 400 | 450 | 700 | 50 | 800 | 908 | 527 | 345 | 580 | 910 | 981 | 260 | 4-Φ14 | 209 |
Strong Pressure for Efficient Air Extraction
The centrifugal airflow design provides concentrated pressure to move cooking fumes, heat, and stale air through ducted exhaust systems.
Air volume scales from 3,360 m³/h on the 2.5A unit up to 27,800 m³/h on the 6A model, with total static pressure reaching up to 1,650 Pa. Air is drawn in axially and accelerated into the scroll housing, maintaining strong discharge velocity across grease filters, elbows, and long vertical exhaust risers.
- Concentrated Airflow — directed discharge built for ducted exhaust runs
- Stable Pressure — 460 to 1,650 Pa total pressure across the series
- Efficient Exhaust — rapid extraction of oil smoke, steam, and heat
Forward-Curved Centrifugal Impeller
The forward-curved multi-vane impeller delivers strong, stable airflow and reliable pressure with reduced turbulence.
By curving the dense blade array in the direction of rotation, the wheel moves high air volumes at moderate shaft speeds (960 or 1,450 r/min). This keeps air velocity uniform across the outlet while lowering acoustic noise compared to high-speed radial blowers.
- Forward-Curved Blades — high airflow output from a compact wheel diameter
- Multi-Vane Design — smooth air acceleration with minimal flow separation
- Stable Airflow & Reliable Pressure — steady delivery under fluctuating hood loads
Thickened Carbon Steel Construction
The thickened carbon steel casing provides enhanced structural strength, while the protective painted finish helps resist wear and corrosion for reliable long-term operation.
Heavy-gauge steel sheet prevents casing flex and panel drumming under continuous static pressure. Sealed seams and an industrial spray-painted finish protect the scroll housing against kitchen grease, humidity, and daily thermal cycling.
- Thickened Steel — rigid volute construction that resists deformation
- Protective Finish — corrosion-resistant coating for oily and humid air streams
- Durable Structure — reinforced flanges and seams for extended service life
Reliable Motor for Continuous Exhaust
The motor is matched to the fan's operating requirements to provide dependable power for commercial kitchen and industrial exhaust applications.
Each fan size is direct-coupled to an industrial asynchronous motor rated from 0.75 kW to 15 kW. Out-of-airstream motor mounting keeps the windings away from direct grease and heat, while finned cast housings dissipate heat during continuous shift operation.
- Stable Power — 0.75 to 15 kW motors matched to the exact impeller load
- Reliable Operation — 4-pole (1,450 r/min) and 6-pole (960 r/min) configurations
- Continuous Exhaust — built for daily peak-hour kitchen and plant duty
Low Noise & Stable Operation
Balanced rotating components and an optimized fan structure help reduce vibration and operating noise for reliable continuous ventilation.
Dynamic balancing eliminates rotor eccentricity before the fan leaves the factory, preventing bearing wear and structural resonance. Combined with the smooth-entry inlet cone and rigid steel housing, the unit runs quietly enough for restaurants, hotels, and institutional buildings.
- Reduced Vibration — dynamically balanced impeller and shaft assembly
- Low Operating Noise — aerodynamic inlet ring and volute reduce air roar
- Smooth Operation — less mechanical stress on bearings and duct connections
Secure Mounting Base
The integrated mounting base helps keep the blower firmly positioned for stable operation in fixed equipment installations.
Heavy channel steel rails and triangular gusset plates support both the scroll housing and the motor overhang. Pre-drilled base holes allow direct bolting to concrete pads, structural steel frames, or spring isolators.
- Integrated Base — unified steel frame supporting both casing and motor
- Firm Positioning — gusseted brackets prevent shifting or tilting under load
- Stable Installation — pre-drilled anchor points for floor or rooftop mounting
Easy Duct Integration
The round inlet and rectangular outlet make it convenient to connect the fan with different duct arrangements and equipment layouts.
Both the circular intake ring and the rectangular discharge flange come factory-drilled with standard bolt patterns. Installers can bolt spiral intake pipes and rectangular exhaust trunks directly to the unit without custom transition fabrication.
- Rectangular Air Outlet — flanged discharge mates directly with main exhaust trunks
- Round Air Inlet — smooth-bell intake connects to standard circular ducting
- Fast On-Site Hookup — pre-drilled bolt circles reduce installation time
Wide Range of Applications
Engineered for commercial kitchen oil-smoke extraction, industrial ventilation, and building exhaust systems.
Commercial Kitchens
High-pressure extraction of heavy cooking fumes, grease vapor, and heat from range hoods.
Hotels & Restaurants
Low-noise kitchen exhaust and back-of-house ventilation for hospitality venues.
Canteens & Food Service
Continuous air extraction for school, hospital, and factory dining facilities.
Factory Workshops
General air exchange and removal of process heat, smoke, and stale air.
Industrial Equipment Cooling
Forced-air cooling and heat dissipation for machinery, ovens, and production lines.
Commercial & Public Buildings
Ducted ventilation and exhaust air handling for shopping centers, complexes, and garages.
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 a 100% run-test on every unit, so each LWFDF11-66 fan arrives ready to install.
Global HVAC&R Exhibitions Participation
Meeting HVAC distributors, project contractors, and OEM engineering teams at international trade fairs worldwide.
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.
Global Market & Client Preference
The LWFDF11-66 series is specified by HVAC distributors, commercial kitchen contractors and OEM clients across Europe, the Middle East, Southeast Asia and the Americas.
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View Product →Frequently Asked Questions
Quick technical answers about the LWFDF11-66 oil-smoke exhaust centrifugal fan series.
What is the LWFDF11-66 centrifugal fan used for?
The LWFDF11-66 series is engineered for oil-smoke extraction in commercial kitchens, hotels, restaurants, and canteens, as well as general ventilation and equipment cooling in factory workshops and public buildings.
Why does the LWFDF11-66 use a forward-curved multi-vane impeller?
A forward-curved multi-vane impeller generates high airflow volume and steady static pressure at lower rotational speeds (960 or 1,450 r/min). This reduces air turbulence and keeps operating noise low in acoustically sensitive areas.
What air volume and total pressure can the LWFDF11-66 deliver?
Air volume ranges from 3,360 m³/h on the LWFDF11-66-2.5A model up to 27,800 m³/h on the LWFDF11-66-6A model. Total pressure ranges from 460 Pa up to 1,650 Pa.
How is the LWFDF11-66 connected to ductwork and mounted on site?
Each unit features a round air inlet and a rectangular air outlet with pre-drilled flanges for direct connection to standard duct layouts, supported by an integrated welded steel mounting base for floor or platform installation.
What motor speeds and power ratings are available?
The series is matched with 4-pole (1,450 r/min) and 6-pole (960 r/min) motors ranging from 0.75 kW to 15 kW, allowing buyers to balance exhaust pressure, airflow volume, and noise requirements.
Does LONGWELL support custom voltages, outlet directions, or OEM orders?
Yes. LONGWELL provides OEM and custom engineering support, including site-specific voltage/frequency matching, discharge angle adjustments, custom flange sizing, and protective surface coatings.
Need a Quote or Custom Specs?
Send us the air volume, total pressure, and installation layout. Our engineers will match the right LWFDF11-66 model and reply within 24 hours.
