Reducer Ricom PP-AL 60/100 to 80/125 — ventilation duct adapter, PP-AL construction

Ricom reducer PP-AL 60/100 to 80/125 is a ventilation duct adapter designed to join round ducts of differing diameters. Constructed from PP-AL composite (polypropylene with an aluminium layer), the reducer provides a stable, corrosion-resistant transition between 60/100 mm and 80/125 mm ventilation systems. It is intended for use in HVAC installations where conversion between these standard round sizes is required, and is compatible with supply and exhaust air ducts in both residential and light commercial settings.

Advantages

The PP-AL composite construction combines the chemical resistance and light weight of polypropylene with an internal aluminium layer that improves stiffness and dimensional stability. The reducer allows a smooth airflow transition with minimal turbulence when properly installed, and its material resists condensation-related corrosion. Its round-to-round stepped design simplifies connection to standard circular duct components and reduces the need for custom fabrication.

Suitable for

• Connecting bathroom, kitchen or utility room exhaust ducts to larger main ventilation lines
• Adapting supply air pipes to match existing ductwork diameters in residential HVAC
• Retrofit projects where duct diameter change is required without replacing whole runs
• Light commercial ventilation systems with standard round duct components

Key specifications

• Material: polypropylene composite with aluminium layer (PP-AL)
• Input diameter: 60/100 mm (round stepped connection)
• Output diameter: 80/125 mm (round stepped connection)
• Construction: round-to-round reducer for ventilation ducts
• Suitable for supply and exhaust air applications
• Corrosion resistance and dimensional stability due to aluminium layer

How to use

Fit the reducer between the smaller and larger round duct segments so that each stepped end fully engages the corresponding pipe diameter. Ensure that mating duct ends are clean and free of burrs; use appropriate collars, clamps or silicone sealant where required to secure airtight joints. Maintain recommended clearances and support spacing for the surrounding ductwork to avoid stress on the adapter. For systems with insulation, ensure the reducer is integrated so that thermal bridging and condensation risk are addressed.

Usage recommendations

Use the reducer in installations where maintaining continuous circular duct geometry is preferred; avoid using multiple abrupt diameter changes in sequence to reduce pressure losses. Inspect joints after installation and during periodic maintenance to confirm seals and fixings remain tight.