Industry-Verified Manufacturing Data (2026)

Induced Draft Fan

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Induced Draft Fan used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Induced Draft Fan is characterized by the integration of Impeller and Housing/Casing. In industrial production environments, manufacturers listed on CNFX commonly emphasize Carbon Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A fan that creates negative pressure to draw exhaust gases through a waste heat recovery system.

Product Specifications

Technical details and manufacturing context for Induced Draft Fan

Definition
An induced draft fan is a critical component in waste heat recovery systems that operates by creating negative pressure (suction) to pull hot exhaust gases from industrial processes through heat exchangers or boilers. It ensures proper flow of flue gases, maintains system pressure balance, and facilitates efficient heat transfer for energy recovery.
Working Principle
The fan's impeller rotates at high speed, creating a low-pressure zone that draws exhaust gases into the system. This negative pressure overcomes system resistance and ensures continuous flow of hot gases through heat recovery equipment, allowing for maximum heat extraction before gases are discharged through the stack.
Common Materials
Carbon Steel, Stainless Steel, Cast Iron
Technical Parameters
  • Fan diameter and impeller dimensions (mm) Customizable
Components / BOM
  • Impeller
    Rotating component that creates airflow through centrifugal or axial action
    Material: Carbon Steel or Stainless Steel
  • Housing/Casing
    Encloses the impeller and directs airflow through the system
    Material: Carbon Steel
  • Shaft
    Transmits torque from motor to impeller
    Material: Alloy Steel
  • Bearings
    Support the rotating shaft and reduce friction
    Material: Steel with lubricated surfaces
  • Motor
    Provides rotational power to drive the fan
    Material: Copper windings, steel housing
Engineering Reasoning
0.5-2.0 kPa negative pressure differential, 800-3600 RPM rotational speed, 50-200°C inlet gas temperature
Structural failure occurs at 3.5 kPa negative pressure differential (exceeding yield strength of 345 MPa steel), bearing seizure at 4500 RPM (exceeding DN value of 1.5×10⁶ mm·rpm), blade resonance at 85 Hz (first natural frequency)
Design Rationale: High-cycle fatigue from pressure-induced alternating stresses exceeding 207 MPa endurance limit, thermal creep deformation above 540°C (0.4×melting point of 1350°C), abrasive wear from particulate loading exceeding 50 mg/Nm³
Risk Mitigation (FMEA)
Trigger Imbalance mass of 0.01 kg at 1.2 m radius creating 0.12 kg·m unbalance
Mode: Vibration amplitude exceeding 4.5 mm/s RMS causing bearing housing fatigue cracks
Strategy: Dynamic balancing to ISO 1940 G2.5 grade (2.5 mm/s residual vibration), real-time vibration monitoring with 3.0 mm/s alert threshold
Trigger Sulfur dioxide concentration of 1500 ppm at 180°C dew point forming sulfuric acid condensation
Mode: Corrosion rate of 0.5 mm/year causing blade thickness reduction below 3.0 mm minimum design thickness
Strategy: Material upgrade to 317L stainless steel (PREN value >35), inlet gas temperature control above 200°C acid dew point

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Induced Draft Fan.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 kPa (1.45 psi) negative pressure differential, with reinforced designs for higher pressure applications
flow rate: 10,000 to 500,000 m³/h (5,900 to 294,000 CFM) depending on model and configuration
temperature: Up to 400°C (752°F) continuous operation, with higher temperature materials available for specific applications
slurry concentration: Not applicable - designed for gas handling only, solid particles limited to <50 mg/m³ with appropriate filtration
Media Compatibility
✓ Combustion exhaust gases (boilers, furnaces) ✓ Process air with moderate particulate loading ✓ Corrosive gas streams with appropriate material selection (stainless steel, special coatings)
Unsuitable: High moisture saturated gas streams with condensation potential (risk of corrosion and impeller imbalance)
Sizing Data Required
  • Required volumetric flow rate (m³/h or CFM) at operating conditions
  • System pressure drop to be overcome (Pa or inches WC)
  • Gas temperature and composition (for material selection and density correction)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bearing failure due to misalignment or lubrication issues
Cause: Improper installation leading to shaft misalignment, inadequate or contaminated lubrication causing overheating and wear
Blade fatigue and erosion from particulate impingement
Cause: High-velocity dust and abrasive particles in flue gas causing material loss and stress concentration at blade edges
Maintenance Indicators
  • Excessive vibration or unusual audible knocking/rumbling during operation
  • Visible blade imbalance or wobble, or sudden increase in motor current draw
Engineering Tips
  • Implement precision laser alignment during installation and regular vibration analysis to detect early bearing and imbalance issues
  • Install inlet particle separators and apply protective coatings on blades to reduce erosive wear, coupled with regular blade thickness inspections

Compliance & Manufacturing Standards

Reference Standards
ISO 13349:2014 (Fans - Classification and performance) ANSI/AMCA 210-16 (Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating) DIN EN 16475-1:2017 (Fans - Performance testing of standardized airways)
Manufacturing Precision
  • Impeller blade thickness: +/-0.5 mm
  • Shaft runout: 0.025 mm maximum
Quality Inspection
  • Dynamic balancing test (ISO 1940-1 Grade G6.3)
  • Vibration analysis (ISO 10816-3 for fan vibration limits)

Factories Producing Induced Draft Fan

Verified manufacturers with capability to produce this product in China

✓ 98% Supplier Capability Match Found

P Project Engineer from Singapore Feb 14, 2026
★★★★★
"The Induced Draft Fan we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."
Technical Specifications Verified
S Sourcing Manager from Germany Feb 11, 2026
★★★★★
"Found 35+ suppliers for Induced Draft Fan on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
P Procurement Specialist from Brazil Feb 08, 2026
★★★★★
"The technical documentation for this Induced Draft Fan is very thorough, especially regarding technical reliability."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

9 sourcing managers are analyzing this specification now. Last inquiry for Induced Draft Fan from Brazil (1h ago).

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Frequently Asked Questions

What is the primary function of an induced draft fan in machinery manufacturing?

An induced draft fan creates negative pressure to draw exhaust gases through waste heat recovery systems, improving efficiency and safety in industrial processes.

What materials are commonly used in induced draft fan construction?

Induced draft fans are typically constructed from durable materials like carbon steel, stainless steel, or cast iron to withstand high temperatures and corrosive environments.

What are the key components of an induced draft fan?

Key components include bearings, housing/casing, impeller, motor, and shaft, all working together to create efficient negative pressure for exhaust gas movement.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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