---
title: "Flexible Duct"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:FLEXIBLE_DUCT"
  data_integrity_hash: "67c48156df185d249ea3f95963ca8552"
  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:FLEXIBLE_DUCT"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/flexible-duct.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/flexible-duct"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-2500 Pa pressure differential, -40°C to 120°C temperature range, 0-25 m/s airflow velocity"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 3000
    unit: "Pa"
    consequence: "Plastic deformation of helical wire reinforcement exceeding yield strength (typically 250 MPa for galvanized steel wire), polymer jacket degradation via Arrhenius equation kinetics with activation energy of 80 kJ/mol for PVC materials"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Helical reinforcement wire corrosion reducing cross-sectional area below 70% of original"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Galvanic protection with zinc coating thickness ≥85 μm, or substitution with 316L stainless steel wire (minimum 11% chromium content)"
  - node_2:
      trigger: "Polymer jacket UV degradation reducing tensile strength below 7 MPa"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Carbon black additive at 2-3% concentration for UV absorption, or fluoropolymer coating with 50 μm minimum thickness"
bom_nodes:
  helical-wire-core:
    type: "component"
    urn: "URN:CNFX:ME:HELICAL_WIRE_CORE"
    interface_type: "physical-logic-coupled"
  inner-liner:
    type: "component"
    urn: "URN:CNFX:ME:INNER_LINER"
    interface_type: "physical-logic-coupled"
  outer-jacket:
    type: "component"
    urn: "URN:CNFX:ME:OUTER_JACKET"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 10380:2012 (METALLIC FLEXIBLE HOSES, ASSEMBLIES AND JOINTS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/flexible-duct.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "c5cea154ba3ba442e5c48b4e925c7d09ed7672798092153e88d0d04e439cca3d"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Flexible Duct

## 1. Technical Definition
A flexible, bendable duct used in HVAC systems to connect rigid ductwork sections and navigate around obstacles.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-2500 Pa pressure differential, -40°C to 120°C temperature range, 0-25 m/s airflow velocity**. Failure boundary: **Collapse at 3000 Pa negative pressure, rupture at 5000 Pa positive pressure, permanent deformation at 150°C for 30 minutes**, Mechanism: **Plastic deformation of helical wire reinforcement exceeding yield strength (typically 250 MPa for galvanized steel wire), polymer jacket degradation via Arrhenius equation kinetics with activation energy of 80 kJ/mol for PVC materials**.

### 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 |
| :--- | :--- | :--- | :--- |
| Helical reinforcement wire corrosion reducing cross-sectional area below 70% of original | 8 | Duct collapse under normal operating pressure (500-1500 Pa) | Galvanic protection with zinc coating thickness ≥85 μm, or substitution with 316L stainless steel wire (minimum 11% chromium content) |
| Polymer jacket UV degradation reducing tensile strength below 7 MPa | 8 | Longitudinal tearing along wire helix path at bend radii &lt;2× duct diameter | Carbon black additive at 2-3% concentration for UV absorption, or fluoropolymer coating with 50 μm minimum thickness |

## 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**: **Extrusion Machine**, **Wire Coiling Machine**, **Spiral Winding Machine**  
**Downstream Applications**: HVAC Duct Systems, Ventilation Duct Assemblies, Air Distribution Networks  

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

### Q: What materials are used in flexible ducts for industrial applications?
**A**: Our flexible ducts feature a helical galvanized steel wire core, aluminum foil inner liner, polyester insulation layer, and durable PVC or polymer outer jacket for maximum durability in industrial environments.

### Q: How do flexible ducts help in machinery manufacturing facilities?
**A**: Flexible ducts provide essential airflow solutions by connecting rigid HVAC ductwork sections and navigating around machinery, equipment, and structural obstacles while maintaining efficient air distribution.

### Q: What are the key components in a flexible duct BOM?
**A**: The bill of materials includes three main components: helical wire core for structural support, inner liner for smooth airflow, and outer jacket for protection against environmental factors and mechanical damage.

## 6. Manufacturing Compliance
- ISO 10380:2012 (METALLIC FLEXIBLE HOSES, ASSEMBLIES AND JOINTS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Flexible Duct](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/flexible-duct)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: FLEXIBLE_DUCT | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: c35586d3
