Connection Piece with Joint SPC DUCO D180/D160 (M/M) — duct transition adapter

SPC DUCO Connection Piece with Joint D180/D160 (M/M) is a duct transition adapter designed to join circular ventilation ducts with 180 mm and 160 mm diameters. The adapter provides a male-to-male joint configuration that enables a tight mechanical connection between different-sized round ducts, facilitating airflow continuity and reducing leakage at the junction. It is intended for use in HVAC installations, air distribution networks and ventilation retrofits where a reliable diameter reduction and sealed joint are required.

Advantages

The connection piece offers a straightforward mechanical coupling that simplifies installation without the need for complex fittings. Its male-to-male joint design promotes a secure fit and helps maintain duct alignment during assembly. The adapter is compatible with standard circular duct systems and supports reliable air flow transfer between sections with minimal pressure loss when installed correctly.

Suitable for

• Connecting a 180 mm circular duct to a 160 mm circular duct in HVAC systems
• Retrofitting existing ventilation networks where diameter reduction is required
• Air distribution branches in residential and light commercial ventilation installations
• Temporary or permanent ducting changes during renovation or repair works

When it may not be suitable

This adapter is intended specifically for circular ducts of the stated diameters; it is not suitable for non-circular duct profiles, flexible ducts that require special clamps, or systems that demand a flanged or gasketed airtight connection. For applications requiring sound attenuation, thermal insulation, or fire-rated components, additional products or specially designed accessories should be used alongside or instead of this simple mechanical adapter.

Key specifications

• Connection type: male-to-male joint
• Input diameter: 180 mm (round)
• Output diameter: 160 mm (round)
• Material: suitable for standard ventilation ductwork (compatible with common metal/plastic circular ducts)
• Application: duct transition / diameter reduction for ventilation systems

How to use

Ensure both duct ends are clean, free of burrs and aligned. Slide the male ends of the adapter into the corresponding duct sections so that the connection seats fully. Where required by the installation, secure the joint with appropriate clamps, rivets or metal tape to prevent axial movement and air leakage. Inspect the joint visually and, if necessary, perform a leak test according to the ventilation system procedures. Follow local codes and HVAC best practices when integrating into larger duct networks.

What to consider before purchase

• Verify that your ducts are circular and measure nominal external diameters to confirm compatibility with 180 mm to 160 mm transition
• Check material compatibility with your existing ductwork (metal to metal, metal to plastic) and whether additional clamps or sealants are needed
• Confirm whether your project requires airtight gaskets, thermal insulation, or acoustic treatment that this adapter does not provide
• Assess installation space and access to ensure the adapter can be fitted and secured properly

Usage recommendations

For durable performance, install the adapter in straight, well-supported duct runs and secure with suitable clamps or tape. Where airtightness is critical, add appropriate sealing tape or mastic at the joint and consider supporting the duct to avoid stress at the transition. If the system requires noise reduction or insulation, combine the adapter with separate attenuation or insulating elements designed for circular ducts.