Description
Boiler Induced Draft Fan
High Airflow with Flexible Adjustment for Industrial Systems. Engineered to maintain negative furnace pressure and extract heavy exhaust.
Key Features at a Glance
A heavy-duty platform built for continuous extraction in boiler rooms and dust collection facilities.
Product Specifications
Complete performance parameters, outline drawings, and dimensional data for the LWIDF5-47 series.
| Model | 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 | H2 | L | L1 | n3-d3 | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LWIDF5-47-2.5A | 250 | 280 | 296 | 8-Φ8 | 123 | 155 | 183 | 2×77.5 | 196 | 228 | 256 | 2×114 | 8-Φ8 | 374 | 410 | 312 | 50 | 725 | 418 | 178 | 330 | 532 | 178 | 630 | 98 | 8-Φ14 | 81 | |
| LWIDF5-47-3.15A | 280 | 300 | 324 | 8-Φ10 | 156 | 188 | 216 | 3×62.6 | 194 | 226 | 254 | 3×75.3 | 12-Φ8 | 334 | 370 | 330 | 60 | 775 | 477 | 202 | 400 | 632 | 222 | 660 | 123 | 6-Φ14 | 94 | |
| LWIDF5-47-4A | 400 | 440 | 462 | 16-Φ10 | 194 | 226 | 254 | 3×75.3 | 250 | 282 | 310 | 3×94 | 12-Φ8 | 334 | 370 | 330 | 60 | 775 | 590 | 247 | 480 | 774 | 280 | 740 | 160 | 6-Φ14 | 113 | |
| LWIDF5-47-5A | 500 | 550 | 580 | 16-Φ10 | 243 | 282 | 310 | 3×94 | 313 | 352 | 380 | 3×117.3 | 12-Φ8 | 394 | 430 | 415 | 50 | 930 | 749 | 315 | 585 | 951 | 350 | 890 | 201 | 6-Φ14 | 171 | |
| LWIDF5-47-6A | 600 | 645 | 675 | 16-Φ10 | 298 | 330 | 358 | 3×110 | 382 | 414 | 442 | 4×103.5 | 14-Φ8 | 647 | 725 | 500 | 50 | 1100 | 896 | 379 | 720 | 1159 | 422 | 1070 | 239 | 7-Φ14 | 286 | |
| LWIDF5-47-7A | 720 | 750 | 790 | 16-Φ12 | 349 | 381 | 409 | 3×127 | 442 | 474 | 502 | 4×118.5 | 14-Φ8 | 784 | 800 | 623 | 50 | 1345 | 1050 | 449 | 830 | 1340 | 492 | 1150 | 282 | 7-Φ14 | 347 |
| Model | Speed (r/min) | Flow Rate (m³/h) | Total Pressure (Pa) | Matching Motor (kW-p) |
|---|---|---|---|---|
| LWIDF5-47-2.5A-0.55-2P-1-001 | 2900 | 600-1113 | 580-397 | 0.55-2 |
| LWIDF5-47-3.15A-1.1-2P-1-001 | 3250 | 2496-1323 | 716-1049 | 1.1-2 |
| LWIDF5-47-3.15A-0.75-2P-1-002 | 2990 | 2297-1218 | 608-883 | 0.75-2 |
| LWIDF5-47-3.15A-0.55-2P-1-003 | 2750 | 2112-1120 | 520-745 | 0.55-2 |
| LWIDF5-47-4A-4-2P-1-001 | 3300 | 5190-2751 | 1393-1992 | 4-2 |
| LWIDF5-47-4A-3-2P-1-002 | 2900 | 4561-2417 | 1079-1481 | 3-2 |
| LWIDF5-47-4A-3-2P-1-003 | 2870 | 4514-2393 | 1059-1451 | 3-2 |
| LWIDF5-47-5A-7.5-2P-1-001 | 2900 | 8909-4723 | 1687-2324 | 7.5-2 |
| LWIDF5-47-5A-5.5-2P-1-002 | 2820 | 8048-4267 | 1373-1893 | 5.5-2 |
| LWIDF5-47-5A-7.5-2P-1-003 | 2900 | 8909-4723 | 1687-2324 | 7.5-2 |
| LWIDF5-47-6A-18.5-2P-1-001 | 2850 | 8020-15129 | 3364-2452 | 18.5-2 |
| LWIDF5-47-6A-15-2P-1-002 | 2620 | 7372-13908 | 2844-2069 | 15-2 |
| LWIDF5-47-6A-18.5-2P-1-003 | 2930 | 13492-8245 | 3168-3550 | 18.5-2 |
| LWIDF5-47-6A-22-2P-1-004 | 2930 | 15553-14523 | 2589-2903 | 22-2 |
| LWIDF5-47-7A-30-2P-1-001 | 2580 | 21747-11529 | 2746-3756 | 30-2 |
| LWIDF5-47-7A-22-2P-1-002 | 2320 | 19556-10367 | 2206-3040 | 22-2 |
| LWIDF5-47-7A-18.5-2P-1-003 | 2200 | 18545-9830 | 1991-2736 | 18.5-2 |
| LWIDF5-47-7A-15-4P-1-004 | 2050 | 17280-9159 | 1716-2373 | 15-4 |
| LWIDF5-47-8A-30-4P-1-001 | 2020 | 25417-13474 | 2187-3001 | 30-4 |
| LWIDF5-47-8A-22-4P-1-002 | 1860 | 23404-12407 | 1853-2550 | 22-4 |
| LWIDF5-47-9A-45-4P-1-001 | 1900 | 34039-18045 | 2452-3364 | 45-4 |
| LWIDF5-47-9A-37-4P-1-002 | 1800 | 32247-17095 | 2197-3020 | 37-4 |
| LWIDF5-47-9A-30-4P-1-003 | 1740 | 31174-16525 | 2052-2821 | 30-4 |
| LWIDF5-47-10A-37-4P-1-001 | 1480 | 19281-31551 | 2697-2246 | 37-4 |
| LWIDF5-47-10A-11-6P-1-002 | 960 | 12507-23592 | 1107-770 | 11-6 |
| LWIDF5-47-11A-55-4P-1-001 | 1460 | 25663-48410 | 2520-2216 | 55-4 |
| LWIDF5-47-11A-15-6P-1-002 | 960 | 166647-31402 | 1282-932 | 15-6 |
| LWIDF5-47-12A-90-4P-1-001 | 1480 | 33318-6280 | 3628-2638 | 90-4 |
| LWIDF5-47-12A-30-6P-1-002 | 960 | 21612-40768 | 1519-1109 | 30-6 |
Robust Steel Casing for Reliable Operation
The sturdy steel casing provides reliable structural support, while the painted finish helps protect the surface for industrial ventilation and boiler draft applications.
Extracting boiler flue gas exposes the fan to aggressive thermal and chemical stress. Fabricated entirely from heavy-duty carbon steel, the LWIDF5-47 casing resists structural warping. The industrial-grade exterior coating further defends the metal against rust and particulate abrasion.
- Carbon Steel Casing — rigid plates withstand heavy industrial environments
- Sturdy Structure — heavily reinforced to prevent mechanical fatigue
- Durable Enclosure — resists abrasion from passing fly ash and soot
High Airflow for Effective Air Movement
The LWIDF5-47 delivers high airflow to support gas extraction and air exchange, helping meet the air-handling demands of boiler and industrial ventilation systems.
Effective induced draft relies on moving massive volumes of exhaust gas quickly. Generating up to 166,647 m³/h of flow rate, this unit powerfully draws smoke and particulates out of the combustion chamber, ensuring the furnace maintains a safe and stable negative pressure.
- High Airflow Capacity — extracts massive volumes of heavy flue gas
- Furnace Negative Pressure — prevents dangerous exhaust backflow
- Effective Air Exchange — keeps factory environments clear of airborne dust
Centrifugal Impeller for Reliable Air Delivery
The centrifugal impeller works with the volute casing to generate airflow and pressure, supporting boiler draft, gas extraction and industrial ventilation.
Fabricated with precision-welded steel blades, the impeller is strictly dynamically balanced to run flawlessly at high rotational speeds. This heavy-duty wheel design minimizes ash adhesion during flue extraction and ensures aerodynamic output remains aggressive and steady over thousands of operating hours.
- Pressure Generation — powers through restrictive boiler and duct networks
- Reliable Air Delivery — dynamically balanced to prevent eccentric stalling
- Industrial Ventilation — engineered specifically for dirty flue gas extraction
Reliable Motor for Industrial Air Handling
The motor is matched to the fan's operating requirements, providing dependable power to drive the impeller for boiler draft and industrial ventilation.
To survive the grueling ambient heat of industrial boiler rooms, these fans are driven by premium industrial motors. Ranging from 0.55 kW to 90 kW, these powerplants offer superior thermal stability, ensuring the fan runs continuously on S1 duty cycles without overheating or losing torque.
- Matched Drive Power — calibrated strictly against the required extraction load
- Dependable Operation — maintains consistent RPM against fluctuating draft conditions
- Continuous Air Supply — rated for non-stop industrial boiler room environments
Moderate Pressure for Ducted Air Delivery
Combining high airflow with moderate pressure, the fan supports gas delivery through ductwork and connected equipment when selected to match the system's resistance.
While standard exhaust fans struggle with complex ducting, the LWIDF5-47 generates up to 3,756 Pa of static lift. This moderate-pressure, high-flow characteristic is perfectly balanced to overcome aerodynamic drag from baghouses and scrubbers without unnecessarily overworking the motor.
- Overcome Flue Resistance — pulls exhaust through dust collectors effortlessly
- Balanced Performance — optimizes both volumetric throughput and static pressure
- Consistent Delivery — prevents gas from stalling in long factory pipelines
Low-Noise Operation for Industrial Environments
Low-noise operation helps reduce operating noise around boiler rooms and industrial ventilation equipment.
Moving massive volumes of air naturally generates mechanical stress. By pairing a perfectly balanced rotor with an ultra-rigid carbon steel casing, we effectively dampen operational resonance. This prevents shaking that damages motor bearings and keeps acoustic levels compliant with factory safety standards.
- Low Noise — thick casing walls restrict acoustic transmission from the impeller
- Low Vibration — dynamic balancing eliminates eccentric shaft wear
- Smooth Operation — protects adjoining ductwork from sympathetic shaking
Flexible Adjustment for Different System Needs
Airflow adjustment and configurable outlet orientation help coordinate the fan with process requirements and duct layouts, providing flexibility for equipment integration.
Every boiler room layout is unique. The LWIDF5-47 is designed with adjustable outlet orientations, allowing installation teams to quickly align the discharge flange with existing vertical or horizontal ducting. Paired with variable-speed compatible motors, plant engineers can precisely tune the extraction rate.
- Adjustable Airflow — matches fluctuating draft requirements seamlessly
- Flexible Outlet Orientation — configurable discharge angles eliminate complex pipe routing
- Easy System Integration — integrates directly into heavy boiler draft networks
Wide Range of Industrial Applications
Built to conquer extreme system resistance in heavy boiler draft and particulate extraction networks.
Boiler Systems
Provides robust induced draft to extract exhaust gases and maintain stable thermal output.
Industrial Dust Extraction
Overcomes aerodynamic drag in baghouses and scrubbers to capture airborne ash effectively.
Dust Exhaust Systems
Generates intense vacuum pressure to safely evacuate hazardous, particulate-laden smoke.
Factory Workshop Ventilation
High-volume extraction to clear out heavy industrial fumes, heat, and stale production air.
Building Air Exchange
Delivers massive volumetric flow to rapidly turn over stagnant air in large commercial facilities.
Pneumatic Conveying Systems
Provides moderate static lift to pneumatically transport light granular solids through duct networks.
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 LWIDF5-47 fan arrives ready to install.
Global HVAC&R Exhibitions Participation
Meeting boiler manufacturers, project contractors, and OEM engineering teams at international trade fairs worldwide.
Trusted by Leading Global OEM Brands
24+ equipment builders rely on LONGWELL for industrial centrifugal blowers 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 LWIDF5-47 series is specified by boiler manufacturers and industrial 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 LWIDF5-47 boiler induced draft fan series.
What is the primary application of the LWIDF5-47 centrifugal fan?
The LWIDF5-47 is specifically designed as an induced draft fan. It extracts massive volumes of flue gas from industrial boilers, maintaining the necessary negative pressure in the furnace. It is also highly effective for large-scale dust extraction and factory ventilation.
What is the airflow capacity of this induced draft fan?
This series is built for high volumetric throughput, with capacities scaling from 600 m³/h up to an immense 166,647 m³/h, depending on the model and motor pairing.
How does the LWIDF5-47 perform under duct resistance?
It features a "moderate pressure" aerodynamic profile. Generating up to 3,756 Pa, it provides enough static lift to pull exhaust through dust collectors and long duct networks without stalling, while prioritizing maximum air volume.
Is the fan casing durable enough for boiler room exhaust?
Yes, the robust steel casing is fabricated from heavy-gauge carbon steel with a protective industrial paint finish, providing strong resistance against the corrosive and abrasive nature of flue gases.
Need a Quote or Custom Specs?
Send us the air volume, total pressure, and installation layout. Our engineers will match the right LWIDF5-47 model and reply within 24 hours.
