Air Ducts: Component Specs, Materials & Applications

Component Specifications

Definition

Air ducts are engineered components within air circulation systems designed to facilitate controlled airflow, ventilation, and air distribution in industrial environments. They form the primary network for conveying conditioned or ambient air from supply units to designated areas while maintaining pressure differentials, temperature control, and contaminant management.

Working Principle

Air ducts operate on fluid dynamics principles, utilizing pressure differentials created by fans or blowers to move air through enclosed pathways. The system maintains laminar or turbulent flow depending on duct design, with cross-sectional geometry, surface smoothness, and insulation affecting airflow efficiency, velocity, and thermal performance.

Materials

Galvanized steel (most common), aluminum, stainless steel (for corrosive environments), flexible polymer composites, fiberglass duct board (insulated), or fabric ducts for specific applications. Material thickness typically ranges from 0.4mm to 1.2mm depending on pressure requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Fire Rating	A2-s1,d0 non-combustible to B-s1,d0 limited combustibility
Leakage Class	A (≤0.027 l/s per m²) to D (≤0.27 l/s per m²) per EN 12237
Pressure Class	Low (≤250 Pa), Medium (251-750 Pa), High (751-1500 Pa)
Velocity Range	2-10 m/s for main ducts, 1-4 m/s for branch ducts
Thermal Conductivity	≤0.04 W/m·K for insulated ducts
Diameter/Rectangular Dimensions	100mm to 2000mm

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

Standards

ISO 6947, ISO 13349, DIN 24194, DIN EN 1507, ASHRAE 62.1

Parent Products

This component is used in the following industrial products

Air Circulation System

A mechanical system that controls and distributes airflow within an industrial-scale food dehydrator to ensure uniform moisture removal.

View Product Details

Ventilation System

A ventilation system for operator cabs in industrial vehicles, providing fresh air circulation and temperature control.

View Product Details

Engineering Analysis

Risks & Mitigation

Fire hazard from combustible dust accumulation
Condensation leading to corrosion and microbial growth
Structural failure from excessive pressure or vibration
Air leakage reducing system efficiency
Noise generation from turbulent airflow

FMEA Triads

Trigger: Improper joint sealing or gasket failure
Failure: Air leakage exceeding 15% of design flow
Mitigation: Use certified sealing compounds, implement pressure testing during installation, and schedule regular leak detection surveys

Trigger: Insufficient support spacing or vibration isolation
Failure: Duct deformation or connection failure
Mitigation: Follow manufacturer's support spacing guidelines (typically 1.5-3m for horizontal ducts), install vibration isolators near fans, and conduct structural inspections annually

Trigger: Inadequate insulation in humid environments
Failure: Condensation causing corrosion and mold growth
Mitigation: Specify proper insulation thickness based on dew point calculations, use vapor barriers, and ensure continuous insulation without thermal bridges

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1mm on diameter for ducts ≤500mm, ±2mm for ducts >500mm; straightness tolerance ≤1mm per meter length

Test Method

Pressure testing per EN 12237 (leakage), airflow measurement using pitot tubes or anemometers, visual inspection per SMACNA standards, and thermal imaging for insulation integrity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Air Ducts

Manufacturer profiles associated with Air Ducts.

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Frequently Asked Questions

What are the main types of industrial air ducts?

The main types include spiral ducts (most common for circular sections), rectangular ducts (for space-constrained areas), flexible ducts (for connections and tight spaces), and fabric ducts (for specialized air distribution).

How do you calculate duct sizing for industrial applications?

Duct sizing is calculated based on airflow requirements (CFM or m³/h), allowable velocity, pressure drop limitations, and system layout using methods like equal friction, velocity reduction, or static regain, typically following ASHRAE or DIN standards.

What maintenance is required for industrial air ducts?

Regular inspection for leaks, corrosion, and insulation damage; cleaning to prevent dust accumulation (especially in food/pharma industries); and verification of pressure differentials. Most systems require professional cleaning every 1-3 years depending on usage.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Air Ducts