Spiral Duct Internal Coupling (Galvanized Steel)
Spiral Duct Internal Coupling (Galvanized Steel) - Image 2
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Spiral Duct Internal Coupling (Galvanized Steel)

Galvanized Steel Spiral Duct Internal Coupling / Sleeve Coupling for Round HVAC Duct Connections

Galvanized steel internal sleeve coupling for joining round spiral ducts, designed for secure alignment, easy installation, and reliable HVAC duct connections.

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Product Description

The Spiral Duct Internal Coupling is designed for joining two round spiral ducts in HVAC ventilation systems. Installed inside the duct ends, it provides a secure and aligned connection for straight duct runs, making installation fast and efficient.

Manufactured from galvanized steel, this internal sleeve coupling offers good corrosion resistance, reliable structural strength, and long service life. The external bead / reinforcement rib improves positioning and connection stability during installation. It is widely used in commercial, industrial, and residential ventilation duct systems.

This fitting is an essential connector for round duct assembly, especially in spiral duct networks requiring clean and accurate inline connections.

Key Features

  • Internal Connection Design   Fits inside two duct ends for secure inline joining
  • Reinforced Bead Structure  External rib improves positioning and connection stability
  • Galvanized Steel Material  Corrosion-resistant and durable for long-term HVAC use
  • Easy Installation  Simple and efficient solution for connecting round spiral ducts
  • Standard Compatibility  Suitable for standard spiral duct systems
  • Wide Size Range    Available in multiple diameters for different project requirements

Applications

  • HVAC ventilation systems
  • Spiral round duct connections
  • Commercial air distribution systems
  • Industrial exhaust and fresh air systems
  • Residential ventilation duct installations
  • Inline joining of round duct sections

Technical Specifications

Size Range (Example)

Size (mm) ØD (V) mm ØD (VX/VS) mm Ød (V) mm Ød (VX/VS) mm t (mm)
80 78.8 79 45 78 0.5
100 98.8 99 45 78 0.5
125 123.8 124 45 78 0.5
140 138.8 – 45 – 0.5
150 148.7 148.9 45 78 0.5
160 158.7 158.9 45 78 0.5
180 178.7 – 45 – 0.5
200 198.6 198.9 45 78 0.5

More sizes are available upon request.

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