Galvanized Spiral Duct (GI Air Duct / Spiral Vent Pipe)
Galvanized Spiral Duct (GI Air Duct / Spiral Vent Pipe) - Image 2
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Galvanized Spiral Duct (GI Air Duct / Spiral Vent Pipe)

Hot-dip galvanized spiral duct features smooth surface and sturdy structure. Low air resistance and outstanding corrosion resistance. 304 stainless steel optional, diversified sizes customizable. Perfect for garage smoke exhaust, kitchen ventilation, industrial air supply and dust removal.

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Product Description

The galvanized spiral duct is widely used in HVAC systems for its superior strength, smooth airflow, and easy installation. Manufactured with spiral forming technology and hot-dip galvanizing, it provides low airflow resistance, reduced noise, and excellent corrosion resistance. Ideal for ventilation, smoke exhaust, and dust collection systems.

Specifications & Materials

  • Type: Round Ventilation Duct System
  • Application: Exhaust, Smoke Ventilation, Air Supply & Dust Collection
  • Customization: Yes (OEM / ODM Supported)
  • Size Range
    • Diameter: 80 mm – 1600 mm
    • (Standard range: 100 mm – 1200 mm)
    • Length: Standard 4 meters per piece (Custom lengths available)
    • Thickness Options  0.5 mm / 0.6 mm / 0.8 mm / 1.0 mm / 1.2 mm / 1.5 mm / 2.0 mm
    • Coating thickness: 5–107 μm (controllable)
  • Material Options
    • Standard Material: Galvanized Steel (Hot-Dip Galvanized)
    • Optional Material: Stainless Steel (e.g., 304)
    • Surface Finish: Smooth, burr-free, zinc-coated silver appearance

Product Features

  • Appearance & Manufacturing
    • Smooth surface without zinc nodules or burrs
    • Formed by advanced spiral forming and hot-dip galvanizing process
    • Clean silver finish suitable for exposed installations
  • Ventilation Performance
    • Smooth inner and outer walls reduce airflow resistance  
    • Low noise operation for air supply and exhaust systems  
    • Energy-efficient airflow performance
  • Structural Strength
    • Excellent strength and rigidity  
    • High resistance to pressure and deformation
    • Long service life
  • Easy Installation
    • Fewer connection points compared to rectangular ducts
    • Can be cut, drilled, and modified on-site  
    • Reduces installation time and labor cost
  • Material Stability & Durability
    • No hydrogen embrittlement or thermal damage  
    • Stable mechanical properties
    • Excellent corrosion resistance (salt spray test ≥ 240 hours)  
    • Suitable for environments with acidic or alkaline air
  • Flexible Customization  Custom diameters, lengths, and materials available
  • Suitable for replacing some traditional hot-dip galvanized duct systems

Applications

  • Core Applications
    • Underground parking garage smoke exhaust systems
    • Kitchen exhaust systems (commercial kitchens, restaurants)
    • General ventilation and air exchange systems
    • Industrial air supply and exhaust systems
  • Extended Applications
    • Office buildings, shopping malls, residential buildings
    • Factory workshops and industrial plants
    • Dust collection systems (painting, printing, manufacturing)
    • Corrosive environment ventilation systems

Product Advantages

  • Cost-Effective Solution  Optimized material usage with excellent durability
  • High Efficiency Ventilation  Lower resistance and noise compared to traditional ducts
  • Reliable Quality  Advanced manufacturing ensures consistent performance
  • Low Maintenance Cost  Maintenance-free after installation

Important Notes

  • This product is custom-made.
  • Need confirm
    • Diameter and length
    • Material type (galvanized or stainless steel)
    • Thickness requirements
    • Application scenario

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