---
title: "Exhaust Ductwork"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:EXHAUST_DUCTWORK"
  data_integrity_hash: "adfd5690222299a35c29e8a0010deaff"
  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:EXHAUST_DUCTWORK"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/exhaust-ductwork.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/exhaust-ductwork"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-2.5 kPa pressure differential, -20°C to 250°C temperature range, 5-25 m/s airflow velocity"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 3.8
    unit: "kPa"
    consequence: "Von Mises yield criterion exceeding 250 MPa stress at duct joints, Arrhenius equation-driven oxidation at elevated temperatures, Helmholtz resonance at natural frequency of 85 Hz"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Corrosive gas condensation forming 0.1M sulfuric acid solution"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "316L stainless steel construction with 3.2 mm minimum thickness and cathodic protection at -0.85V potential"
  - node_2:
      trigger: "Thermal cycling between 50°C and 200°C at 15 cycles/hour"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Inconel 625 expansion joints with 150% thermal expansion allowance and post-weld heat treatment at 1150°C"
bom_nodes:
  straight-duct-section:
    type: "component"
    urn: "URN:CNFX:ME:STRAIGHT_DUCT_SECTION"
    interface_type: "physical-logic-coupled"
  elbow-fitting:
    type: "component"
    urn: "URN:CNFX:ME:ELBOW_FITTING"
    interface_type: "physical-logic-coupled"
  flange-connection:
    type: "component"
    urn: "URN:CNFX:ME:FLANGE_CONNECTION"
    interface_type: "physical-logic-coupled"
  support-hanger:
    type: "component"
    urn: "URN:CNFX:ME:SUPPORT_HANGER"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 13349:2014 - FANS FOR GENERAL PURPOSES - VOCABULARY AND DEFINITIONS OF CATEGORIES"
    scope: "Verified Engineering Specification"
  - standard: "DIN 24163-1:2011 - VENTILATION DUCTWORK - PART 1: GENERAL REQUIREMENTS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/exhaust-ductwork.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "3ac2485f81641d48768ba3d60bb7b232584e3e2ae3c4e7c82d237f18d2e9df08"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Exhaust Ductwork

## 1. Technical Definition
A network of ducts designed to transport exhaust air, fumes, or contaminants from industrial processes or equipment to the outside environment.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-2.5 kPa pressure differential, -20°C to 250°C temperature range, 5-25 m/s airflow velocity**. Failure boundary: **Structural collapse at 3.8 kPa pressure differential, material degradation at 300°C continuous temperature, resonance failure at 28 m/s airflow velocity**, Mechanism: **Von Mises yield criterion exceeding 250 MPa stress at duct joints, Arrhenius equation-driven oxidation at elevated temperatures, Helmholtz resonance at natural frequency of 85 Hz**.

### 2.1 Analytical Physics Model
Governed by the **Darcy-Weisbach Pressure Drop**:

> **Primary Equation**: $\Delta P = f \cdot \frac{L}{D} \cdot \frac{\rho v^2}{2}$  
> **Engineering Impact**: Critical for sizing CIP (Clean-In-Place) pump heads.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| f | Friction Factor | Engineering Constant |
| L | Pipe Length | Engineering Constant |
| v | Velocity | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Corrosive gas condensation forming 0.1M sulfuric acid solution | 8 | Galvanic corrosion at carbon steel-aluminum joints with 0.5 mm/year material loss rate | 316L stainless steel construction with 3.2 mm minimum thickness and cathodic protection at -0.85V potential |
| Thermal cycling between 50°C and 200°C at 15 cycles/hour | 8 | Low-cycle fatigue cracking at welded seams following Coffin-Manson equation with 10^4 cycle life | Inconel 625 expansion joints with 150% thermal expansion allowance and post-weld heat treatment at 1150°C |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Industrial Exhaust Fan**, **Dust Collector System**, **Air Filtration Unit**  
**Downstream Applications**: Ventilated Manufacturing Facility, Compliant Industrial Workspace, Safe Processing Environment  

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

### Q: What materials are best for corrosive fume exhaust systems?
**A**: For corrosive environments, stainless steel (especially 316 grade) or Fiberglass Reinforced Plastic (FRP) are recommended due to their excellent corrosion resistance against chemical fumes and moisture.

### Q: How do I determine the right duct size for my machinery exhaust?
**A**: Duct sizing depends on airflow volume (CFM), velocity requirements, and the type of contaminants. Consult ASHRAE standards and consider static pressure, with typical industrial systems requiring 1,500-4,000 CFM and 6-12 inch diameters.

### Q: What maintenance is required for industrial exhaust ductwork?
**A**: Regular inspection for corrosion, leaks, and buildup; cleaning of interior surfaces (especially for grease or particulate accumulation); checking support hangers and flange connections; and testing airflow efficiency annually.

## 6. Manufacturing Compliance
- ISO 13349:2014 - FANS FOR GENERAL PURPOSES - VOCABULARY AND DEFINITIONS OF CATEGORIES
- DIN 24163-1:2011 - VENTILATION DUCTWORK - PART 1: GENERAL REQUIREMENTS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Exhaust Ductwork](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/exhaust-ductwork)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: EXHAUST_DUCTWORK | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 7b374450
