Description
Boiler Induced Draft Fan
Reliable Draft for Industrial Boiler Exhaust Systems. Specifically engineered to extract 200°C flue gas and maintain stable negative furnace pressure.
Product Specifications
Complete performance parameters, outline drawings, and dimensional data for the LWIDF6-41 series.
| Model | Speed (r/min) | Matching Motor (kW-p) | Flow Rate (m³/h) | Total Pressure (Pa) |
|---|---|---|---|---|
| LWIDF6-41-3.55A-1.5-2P-1-001 | 2950 | 1.5-2 | 2962-841 | 588-1448 |
| LWIDF6-41-4A-3-2P-1-001 | 3450 | 3.0-2 | 3996-1355 | 1893-2676 |
| LWIDF6-41-4.5A-5.5-2P-1-001 | 3250 | 5.5-2 | 5522-2574 | 2058-2873 |
| LWIDF6-41-4.5A-4-2P-1-002 | 2925 | 4.0-2 | 4970-2317 | 1667-2327 |
| LWIDF6-41-5.4A-11-2P-1-001 | 2900 | 11-2 | 8901-4350 | 2491-3240 |
| LWIDF6-41-5.4A-7.5-2P-1-002 | 2600 | 7.5-2 | 7980-3900 | 2002-2604 |
| LWIDF6-41-7.1A-18.5-4P-1-001 | 2200 | 18.5-4 | 15819-8171 | 2454-3283 |
| LWIDF6-41-7.1A-15-4P-1-002 | 2100 | 15-4 | 15100-7800 | 2236-2991 |
| LWIDF6-41-7.1A-11-4P-1-003 | 1915 | 11-4 | 13700-7113 | 1859-2487 |
| LWIDF6-41-9A-37-4P-1-001 | 1965 | 37-4 | 28719-14866 | 3145-4208 |
| LWIDF6-41-9A-30-4P-1-002 | 1750 | 30-4 | 25630-13239 | 2495-3338 |
| LWIDF6-41-9A-22-4P-1-003 | 1640 | 22-4 | 24019-12407 | 2191-2931 |
| LWIDF6-41-10A-37-4P-1-001 | 1600 | 37-4 | 32144-16604 | 2575-3444 |
| LWIDF6-41-11.2A-45-4P-1-001 | 1480 | 45-4 | 41773-21578 | 2764-3697 |
| 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 | H | H1 | H2 | L | L1 | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LWIDF6-41-3.55A | 219 | 255 | 285 | 8-Φ10 | 112 | 144 | 172 | 2×72 | 226 | 258 | 286 | 3×86 | 10-Φ8 | 334 | 370 | 330 | 60 | 775 | 594 | 260 | 440 | 735 | 252 | 690 | 181 | 96 |
| LWIDF6-41-4A | 224 | 254 | 284 | 8-Φ10 | 123 | 155 | 183 | 2×77.5 | 246 | 278 | 306 | 3×92.7 | 10-Φ8 | 334 | 370 | 330 | 60 | 775 | 662 | 294 | 480 | 805 | 284 | 620 | 94 | 103 |
| LWIDF6-41-4.5A | 280 | 306 | 324 | 8-Φ10 | 144 | 176 | 204 | 2×88 | 286 | 318 | 346 | 3×106 | 10-Φ8 | 334 | 370 | 405 | 60 | 925 | 746 | 323 | 540 | 913 | 320 | 770 | 229 | 131 |
| LWIDF6-41-5.4A | 335 | 380 | 420 | 8-Φ10 | 170 | 202 | 230 | 2×101 | 328 | 360 | 388 | 3×120 | 10-Φ8 | 394 | 430 | 490 | 50 | 1080 | 883 | 380 | 650 | 1091 | 382 | 930 | 281 | 184 |
| LWIDF6-41-7.1A | 440 | 486 | 526 | 8-Φ10 | 226 | 270 | 312 | 3×90 | 455 | 496 | 544 | 4×124 | 14-Φ10 | 464 | 500 | 550 | 50 | 1200 | 1157 | 500 | 830 | 1478 | 504 | 1040 | 361 | 317 |
Centrifugal Impeller for Reliable Gas Delivery
The centrifugal impeller works with the volute casing to guide gas flow and build pressure for effective boiler exhaust.
Precision-balanced to eliminate vibration during continuous 200°C operation. The aerodynamic blade design aggressively pulls dense, hot flue gases from the combustion chamber, preventing dangerous exhaust backflow and maintaining steady furnace efficiency.
- Effective Boiler Exhaust — rapidly extracts high-temperature smoke and ash
- Dynamic Balancing — completely eliminates rotational stalling and vibration
- High-Heat Resistance — built to process 200°C flue gas continuously
Effective Draft for Boiler Exhaust
The centrifugal fan provides the draft needed to move flue gas through the boiler exhaust system. Matching fan airflow and pressure to the system requirements helps meet the operating needs of the boiler.
Creating a stable vacuum is essential for efficient combustion. This induced draft fan overcomes aerodynamic resistance from long flues and particulate filters, forcibly pulling the hot exhaust out. Its targeted aerodynamic curve prevents flame instability in industrial boiler setups.
- Flue Gas Extraction — safely evacuates searing fumes from the facility
- Airflow Matching — stabilizes combustion across different firing rates
- Pressure Matching — overcomes resistance from baghouses and scrubbers
Matched to Your Boiler Capacity
For industrial boilers with steam outputs of 0.5–10 t/h, the LWIDF6-41 series provides reliable induced draft power, with multiple models to meet different airflow and pressure requirements.
Sizing an ID fan incorrectly leads to poor heat transfer or wasted energy. This series is precisely calibrated for small to mid-sized industrial boiler installations. Plant engineers can select the exact aerodynamic duty point needed to optimize their specific 0.5–10 t/h steam generation circuit.
- 0.5-10 t/h Capacity — tailored specifically for common industrial steam boiler sizes
- Reliable Induced Draft Power — sustains negative pressure for consistent heat output
- Multiple Models — extensive range of motor and impeller combinations
Designed for Boiler Exhaust Conditions
Designed for boiler flue gas at 200°C, the LWIDF6-41 provides reliable induced draft to support gas extraction through the boiler exhaust system.
Standard ventilation blowers will quickly warp or suffer bearing failure when exposed to the intense thermal load of active combustion exhaust. The LWIDF6-41 incorporates heat-resistant structural materials and specialized cooling geometries to reliably handle constant 200°C gas extraction.
- 200°C Gas Temperature — engineered specifically to withstand scalding flue gases
- Boiler Exhaust Support — maintains structural integrity during thermal expansion
- Continuous Extraction — guarantees safe smoke removal during 24/7 operations
Thickened Carbon Steel Casing
Fine craftsmanship and a spray-painted finish provide a durable surface with good wear resistance, while the reinforced structure supports reliable long-term operation.
Extracting particulate-laden flue gas subjects the fan casing to severe chemical and abrasive stress. Fabricated entirely from heavy-gauge carbon steel plates, the LWIDF6-41 volute resists structural fatigue. The industrial-grade exterior coating further defends the metal against rust in humid boiler rooms.
- Carbon Steel Casing — rigid plates withstand immense internal pressure and heat
- Spray-Painted Finish — protects against industrial corrosion and humid atmospheres
- Reinforced Structure — heavily braced to prevent mechanical drumming
Flexible Orientations for Easier Duct Connection
Available in left- and right-hand rotation configurations, both featuring a single-inlet design. Outlet angles of 0°, 90°, 180° and 270° help match different duct routes and equipment layouts.
Retrofitting an ID fan into an existing boiler room often involves navigating tight spaces and rigid pipework. The LWIDF6-41 is highly modular. Installers can specify the exact rotation and discharge angle needed to align the flanged outlet perfectly with the factory's main exhaust trunk, eliminating the need for complex custom duct transitions.
- 0°, 90°, 180°, 270° Outlets — matches any vertical or horizontal ducting geometry
- Left/Right Rotation — adaptable to specific spatial constraints in the boiler room
- Easy Equipment Layout — simplifies mechanical integration and minimizes installation time
Two Drive Configurations for Different Installation Needs
Choose the drive arrangement that best matches your installation space and operating requirements.
C Type | Belt Drive
A belt-driven arrangement provides flexibility in motor positioning and transmission ratio selection. This isolates the motor from the high-temperature volute and helps perfectly match the required fan speed to the specific draft requirements of the boiler installation layout.
D Type | Coupling Drive
The motor connects to the fan shaft through a heavy-duty coupling, providing a direct, highly stable power transmission path with zero belt slip. This arrangement is selected to suit massive industrial equipment layouts and high-kW motor operating requirements.
Induced Draft for Industrial Boiler Applications
Built to extract massive volumes of 200°C flue gas and safely maintain negative furnace pressure.
Industrial Boilers
Extracts combustion gases efficiently from 0.5-10 t/h systems to sustain stable thermal output.
Factory Steam Supply
Maintains negative furnace pressure to guarantee consistent heat generation for plant-wide steam lines.
Textile Equipment
Safely evacuates high-temperature exhaust generated during large-scale textile dyeing and drying processes.
Food & Feed Processing
Removes moisture-heavy, particulate-laden process air from industrial baking and pelletizing ovens.
Paper Manufacturing Plants
Drives the intense draft required by the massive steam boilers that power paper drying rollers.
Centralized Ventilation Projects
Provides the massive volumetric flow rate required to turn over stale air across extensive factory floors.
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 LWIDF6-41 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 LWIDF6-41 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 LWIDF6-41 boiler induced draft fan.
What is the primary function of the LWIDF6-41 fan?
It is an induced draft fan engineered to extract high-temperature flue gases from industrial boiler systems, ensuring proper negative pressure is maintained within the combustion chamber.
What boiler capacities is this fan suitable for?
The LWIDF6-41 series provides reliable draft power designed specifically to match industrial boilers with steam outputs ranging from 0.5 to 10 tons per hour (t/h).
Can it handle high-temperature exhaust?
Yes, it is purpose-built for boiler exhaust conditions and can reliably handle continuous flue gas extraction at temperatures up to 200°C.
Are the outlet angles adjustable for installation?
The fan features a single-inlet design available in both left- and right-hand rotations, with configurable outlet angles at 0°, 90°, 180°, and 270° to easily match existing duct layouts.
Need a Quote or Custom Specs?
Send us the air volume, total pressure, and installation layout. Our engineers will match the right LWIDF6-41 model and reply within 24 hours.
