---
title: "Induced Draft Fan"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:INDUCED_DRAFT_FAN"
  data_integrity_hash: "a1f770d2dd9066032f043e1c5a4b4645"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:INDUCED_DRAFT_FAN"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/induced-draft-fan.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/induced-draft-fan"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-2.0 kPa negative pressure differential, 800-3600 RPM rotational speed, 50-200°C inlet gas temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 3.5
    unit: "kPa"
    consequence: "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"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Imbalance mass of 0.01 kg at 1.2 m radius creating 0.12 kg·m unbalance"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "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"
  - node_2:
      trigger: "Sulfur dioxide concentration of 1500 ppm at 180°C dew point forming sulfuric acid condensation"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Material upgrade to 317L stainless steel (PREN value &gt;35), inlet gas temperature control above 200°C acid dew point"
bom_nodes:
  impeller:
    type: "part"
    urn: "URN:CNFX:ME:IMPELLER"
    interface_type: "physical-logic-coupled"
  housingcasing:
    type: "component"
    urn: "URN:CNFX:ME:HOUSINGCASING"
    interface_type: "physical-logic-coupled"
  shaft:
    type: "component"
    urn: "URN:CNFX:ME:SHAFT"
    interface_type: "physical-logic-coupled"
  bearings:
    type: "part"
    urn: "URN:CNFX:ME:BEARINGS"
    interface_type: "physical-logic-coupled"
  motor:
    type: "part"
    urn: "URN:CNFX:ME:MOTOR"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 13349:2014 (FANS - CLASSIFICATION AND PERFORMANCE)"
    scope: "Verified Engineering Specification"
  - standard: "DIN EN 16475-1:2017 (FANS - PERFORMANCE TESTING OF STANDARDIZED AIRWAYS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/induced-draft-fan.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "c42c4a355dbb7c1a8c4c7049e30a8c188e1a5d9bd9f4813cca38fded89217489"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Induced Draft Fan

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

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-2.0 kPa negative pressure differential, 800-3600 RPM rotational speed, 50-200°C inlet gas temperature**. Failure boundary: **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)**, Mechanism: **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**.

### 2.1 Analytical Physics Model
Governed by the **Harmonic Vibration Force Generation**:

> **Primary Equation**: $F_e = m \cdot r \cdot \omega^2 \sin(\omega t)$  
> **Engineering Impact**: Calculates centrifugal force for vibratory sifters/feeders.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| m | Eccentric Mass | Engineering Constant |
| r | Radius | Engineering Constant |
| \omega | Angular Frequency | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Imbalance mass of 0.01 kg at 1.2 m radius creating 0.12 kg·m unbalance | 8 | Vibration amplitude exceeding 4.5 mm/s RMS causing bearing housing fatigue cracks | 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 |
| Sulfur dioxide concentration of 1500 ppm at 180°C dew point forming sulfuric acid condensation | 8 | Corrosion rate of 0.5 mm/year causing blade thickness reduction below 3.0 mm minimum design thickness | Material upgrade to 317L stainless steel (PREN value &gt;35), inlet gas temperature control above 200°C acid dew point |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Impeller](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/impeller.md) `(Standalone System)`
- [Bearings](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/bearings.md) `(Standalone System)`
- [Motor](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/motor.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Waste Heat Recovery Boiler**, **Dust Collector System**, **Variable Frequency Drive**  
**Downstream Applications**: Steam for Power Generation, Preheated Combustion Air, Process Heat for Industrial Applications  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the primary function of an induced draft fan in machinery manufacturing?
**A**: An induced draft fan creates negative pressure to draw exhaust gases through waste heat recovery systems, improving efficiency and safety in industrial processes.

### Q: What materials are commonly used in induced draft fan construction?
**A**: Induced draft fans are typically constructed from durable materials like carbon steel, stainless steel, or cast iron to withstand high temperatures and corrosive environments.

### Q: What are the key components of an induced draft fan?
**A**: Key components include bearings, housing/casing, impeller, motor, and shaft, all working together to create efficient negative pressure for exhaust gas movement.

## 6. Manufacturing Compliance
- ISO 13349:2014 (FANS - CLASSIFICATION AND PERFORMANCE)
- DIN EN 16475-1:2017 (FANS - PERFORMANCE TESTING OF STANDARDIZED AIRWAYS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Induced Draft Fan](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/induced-draft-fan)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **5** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: INDUCED_DRAFT_FAN | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: d7f7c3d2
