Structured Manufacturing Data (2026)

Flexible Duct

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Flexible Duct 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 Flexible Duct is characterized by the integration of Helical wire core and Inner liner. In industrial production environments, manufacturers listed on CNFX commonly emphasize Galvanized steel wire construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

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Product Specifications

Technical details and manufacturing context for Flexible Duct

Definition

A flexible duct is a key component within ductwork systems that provides adaptable connectivity between rigid duct sections. It allows for installation in confined spaces, accommodates misalignments, and enables routing around structural obstacles while maintaining airflow. Typically constructed with a helical wire core and flexible insulation layers, it serves as a transitional element in ventilation, heating, and air conditioning applications.

Working Principle

Flexible ducts function by maintaining an open, continuous passage for air movement while allowing bending and compression. The helical wire reinforcement provides structural integrity to prevent collapse during airflow, while the flexible outer jacket accommodates directional changes without restricting flow. Air pressure differentials drive movement through the duct, with minimal resistance due to the smooth interior lining.

Common Materials

Galvanized steel wire, Aluminum foil, Polyester insulation, PVC or polymer outer jacket

Technical Parameters

Diameter range typically from 75mm to 600mm, with standard lengths of 3-10 meters (mm) Per Request

Components / BOM

Helical wire core Part
Provides structural support and prevents collapse during airflow

Material: Galvanized steel
Inner liner Part
Creates smooth airflow surface and provides thermal insulation

Material: Aluminum foil with polyester backing
Outer jacket Part
Protects against environmental factors and provides vapor barrier

Material: PVC or polymer

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Flexible Duct.

Applied To / Applications

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

Ductwork

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Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits

pressure:	Up to 2.5 in. w.g. (0.09 psi) static pressure
other spec:	Air velocity: Up to 4000 FPM (20 m/s), Bend radius: Minimum 1x duct diameter
temperature:	-40°F to 250°F (-40°C to 121°C)

Media Compatibility

✓ Conditioned Air ✓ Ventilation Air ✓ Low-Pressure Exhaust Gases

Unsuitable: Corrosive Chemical Fumes or High-Particulate Slurries

Sizing Data Required

Required Airflow (CFM)
Available Space/Length
Static Pressure Drop Allowance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Material fatigue and cracking

Cause: Repeated flexing beyond design limits, vibration-induced stress cycles, and exposure to temperature fluctuations causing polymer degradation and metal fatigue at connection points.

Internal liner delamination and erosion

Cause: Abrasive particulate flow, chemical attack from conveyed media, moisture accumulation leading to microbial growth, and improper installation creating turbulent flow patterns that accelerate wear.

Maintenance Indicators

Visible sagging or distortion of duct sections indicating structural weakening or internal blockage
Audible flapping or whistling noises during operation suggesting liner separation, holes, or loose connections

Engineering Tips

Implement proper support spacing and avoid sharp bends - maintain minimum bend radius per manufacturer specifications to prevent stress concentration and material fatigue.
Install inspection ports at strategic locations and conduct regular internal visual inspections using borescopes to detect early signs of liner wear, corrosion, or buildup before catastrophic failure occurs.

Compliance & Manufacturing Standards

Reference Standards

ISO 10380:2012 (Metallic flexible hoses, assemblies and joints) ASTM C1338 (Standard Test Method for Determining Fungi Resistance of Insulation Materials and Facings) EN 13103 (Railway applications - Wheelsets and bogies - Non-powered axles - Design method)

Manufacturing Precision

Bore diameter: +/- 0.5 mm
Length: +/- 1.5% of total length

Quality Inspection

Leakage Test (Pressure test at 1.5 times working pressure)
Flexibility Test (Minimum bend radius verification)

Factories Producing Flexible Duct

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are used in flexible ducts for industrial applications?

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.

How do flexible ducts help in machinery manufacturing facilities?

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.

What are the key components in a flexible duct BOM?

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.

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.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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