Editorial Technical Reference

ID Fan

This page explains how ID Fan is classified within Chemical Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A centrifugal or axial fan used to create negative pressure and draw exhaust gases through an off-gas cleaning system.

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Product Specifications

Technical details and manufacturing context for ID Fan

Definition
The ID (Induced Draft) Fan is a critical component within an Off-gas Cleaning System, responsible for creating the necessary negative pressure (suction) to pull contaminated exhaust gases from industrial processes through the entire cleaning train. It ensures proper gas flow through scrubbers, filters, and other treatment units before the cleaned gas is discharged to the atmosphere. The fan's impeller rotates at high speed, imparting kinetic energy to the gas stream. This creates a region of low pressure at the fan inlet, drawing gas in. The gas is then accelerated and discharged at the outlet, overcoming the system's pressure drop (resistance from ducts, dampers, and cleaning equipment).

In chemical manufacturing, the ID fan must handle potentially corrosive or abrasive gas streams. Materials on file include carbon steel, stainless steel (for corrosive gases), and alloy steel. The fan is selected based on required air flow rate (5000–50000 m³/h), static pressure (1000–5000 Pa), operating temperature (-20–200 °C), motor power (5.5–90 kW), voltage (380 V, three-phase, 50 Hz), speed (1450–2950 rpm), noise level (75–95 dB(A) at 1 m), and weight (300–3000 kg). Impeller and casing materials are typically Q235B carbon steel, with corrosion coating for the casing. Ingress protection for motor and electrical components is IP54–IP65. These values are reference ranges and must be verified for the specific model and application.

Standards such as ISO 5801 for fan performance, IEC 60034 for motors, IEC 60038 for voltage/frequency, ISO 13347 for noise, GB/T 700 for carbon steel, and IEC 60529 for ingress protection are used as procurement references. The ID fan is a component, not a standalone product; it must be integrated with the off-gas cleaning system. Selection requires defining gas composition, temperature, flow rate, and system resistance. Verification questions include: What is the actual gas composition and temperature? What is the required flow and pressure? What materials are compatible with the gas? What are the installation and maintenance requirements? Maintenance signals include increased vibration, noise, or reduced flow, indicating impeller wear, imbalance, or bearing issues. Failure boundaries include operating beyond temperature or pressure limits, which can cause material degradation or mechanical failure. Always confirm model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The fan's impeller rotates at high speed, imparting kinetic energy to the gas stream. This creates a region of low pressure at the fan inlet, drawing gas in. The gas is then accelerated and discharged at the outlet, overcoming the system's pressure drop (resistance from ducts, dampers, and cleaning equipment). The fan operates on the induced draft principle, meaning it pulls gas through the system rather than pushing it. The impeller design (centrifugal or axial) determines the pressure and flow characteristics. The fan must be matched to the system curve to ensure stable operation and avoid surge or stall conditions.
Common Materials
Carbon Steel, Stainless Steel (for corrosive gases), Alloy Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Air Flow Rate5000–50000 m³/hDetermines system capacityISO 5801
Static Pressure1000–5000 PaOvercome system resistanceISO 5801
Operating Temperature-20–200 °CMaterial limits for impeller and casing
Motor Power5.5–90 kWMatch to fan curveIEC 60034
Voltage380 VThree-phase, 50 HzIEC 60038
Frequency50 HzStandard industrial supplyIEC 60038
Speed1450–2950 rpmDirect or belt driven
Noise Level75–95 dB(A)At 1 m distanceISO 13347
Impeller MaterialQ235BCarbon steel for standard serviceGB/T 700
Casing MaterialQ235BCarbon steel with corrosion coatingGB/T 700
Ingress ProtectionIP54–IP65Motor and electrical componentsIEC 60529
Weight300–3000 kgDepends on size and material

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Impeller
    Rotating component with blades that imparts energy to the gas, creating flow and pressure.
    Material: Steel (Carbon, Stainless, or Alloy)
  • Casing / Housing Part
    Encloses the impeller, guides the gas flow, and contains the pressure.
    Material: Steel Plate
  • Shaft Part
    Transmits torque from the motor to the impeller.
    Material: Alloy Steel
  • Bearings
    Support the rotating shaft, minimizing friction and maintaining alignment.
    Material: Steel (with Babbitt or roller elements)
  • Drive System (Motor & Coupling)
    Provides the rotational power to the fan shaft.
    Material: Various (Motor: Copper, Steel; Coupling: Steel, Rubber)
  • Inlet/Outlet Dampers or Vanes
    Control the flow of gas into or out of the fan for system regulation.
    Material: Steel

Applied To / Applications

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

Off-gas Cleaning System
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 kPa negative pressure (typical), higher for specialized designs
flow rate: 1,000 to 500,000 m³/h (depending on size and design)
temperature: Up to 400°C (with appropriate materials)
slurry concentration: Not applicable - designed for gases only
Media Compatibility
✓ Flue gases from combustion processes ✓ Process exhaust with particulate matter ✓ Corrosive off-gases (with appropriate material selection)
Unsuitable: Environments with explosive dust concentrations or flammable gas mixtures without proper explosion-proof design
Sizing Data Required
  • Required volumetric flow rate (m³/h)
  • System pressure drop (Pa or kPa)
  • Gas temperature and composition

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Imbalance-induced bearing failure
Cause: Accumulation of material on fan blades causing mass imbalance, leading to excessive vibration that accelerates bearing wear and eventual seizure or fracture.
Fatigue cracking of blades or impeller
Cause: Cyclic stresses from aerodynamic forces, resonance conditions, or thermal cycling, often exacerbated by corrosion or material defects, leading to crack initiation and propagation.
Maintenance Indicators
  • Excessive vibration levels detected by sensors or felt physically, often accompanied by unusual humming or rumbling noises.
  • Sudden increase in motor amperage or power consumption without a corresponding change in system demand, indicating increased mechanical resistance.
Engineering Tips
  • Implement regular dynamic balancing and alignment checks using vibration analysis tools to detect and correct imbalance before it causes bearing or structural damage.
  • Establish a rigorous cleaning schedule for fan blades and internal passages to prevent material buildup, and apply protective coatings to combat corrosion in harsh environments.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 5801:2017 - Industrial fans - Performance testing using standardized airways ANSI/AMCA 210-16 - Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating DIN EN ISO 14694:2005 - Industrial fans - Specifications for balance quality and vibration levels

Quoted from the published standard.

Manufacturing Precision
  • Impeller diameter: +/-0.5% of nominal dimension
  • Shaft alignment: Runout tolerance of 0.05mm per 100mm length
Quality Inspection
  • Vibration analysis test to ISO 10816 standards
  • Non-destructive testing (NDT) of welds using magnetic particle inspection

Manufacturers of ID Fan

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Frequently Asked Questions

What is the purpose of an ID fan in an off-gas cleaning system?

The ID fan creates negative pressure to draw contaminated exhaust gases from industrial processes through the entire cleaning train, including scrubbers, filters, and other treatment units, before the cleaned gas is discharged to the atmosphere.

What materials are available for the ID fan?

Materials on file include carbon steel, stainless steel (for corrosive gases), and alloy steel. The impeller and casing are typically Q235B carbon steel, with corrosion coating for the casing. Material selection depends on the gas composition and temperature.

What are the typical performance ranges for an ID fan?

Reference ranges include air flow rate 5000–50000 m³/h, static pressure 1000–5000 Pa, operating temperature -20–200 °C, motor power 5.5–90 kW, speed 1450–2950 rpm, and noise level 75–95 dB(A) at 1 m. These are directory references and must be confirmed for the specific model.

What standards apply to ID fans?

Relevant standards include ISO 5801 for fan performance, IEC 60034 for motors, IEC 60038 for voltage/frequency, ISO 13347 for noise, GB/T 700 for carbon steel, and IEC 60529 for ingress protection. These are procurement references, not proof of certification.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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