Ventilation round duct 125 mm × 1 m airRoxy model 02-478

The airRoxy round ventilation duct 125 mm × 1 m (model 02-478) is a straight circular duct segment intended for air distribution and exhaust in residential and light-commercial HVAC systems. With a 125 mm internal diameter and a one-metre length, it provides a standardized connection point for fans, vents and other ducting components. The duct is designed to create a continuous airflow path in ventilation installations where a compact circular section is required.

Advantages

This round duct offers a uniform circular cross-section that reduces turbulence compared with irregular channels and simplifies connections to circular fittings. Its one-metre length makes it easy to plan and install in confined spaces, allowing installers to combine multiple segments for longer runs or cut to fit when adjustments are needed. The component is compatible with common 125 mm ventilation accessories and supports straightforward integration into existing ductwork layouts.

Suitable for

• Connecting household and small commercial exhaust fans to ductwork
• Extending ventilation runs in kitchens, bathrooms and utility rooms
• Creating straight duct sections in new HVAC installations
• Repairing or replacing damaged sections of 125 mm circular ducts

Key specifications

• Internal diameter: 125 mm
• Length: 1 metre
• Cross-section: circular
• Application: air distribution and exhaust in residential and light-commercial systems
• Compatibility: mates with standard 125 mm circular ventilation fittings

How to use

Measure the required run and determine the number of segments needed to form a continuous duct path. Slide the duct ends into compatible fittings or connectors and secure joints with appropriate clamps, foil tape or duct sealant to prevent air leakage. If trimming is required, cut the segment to length with a suitable cutting tool and deburr the cut edges before making connections. Ensure the assembled duct has proper support and minimal sagging to maintain airflow efficiency.

Usage recommendations

Use corrosion-resistant clamps or tape for long-term installations and maintain accessible inspection points in runs longer than a few metres. Avoid sharp bends immediately adjacent to fans to reduce airflow resistance, and follow local building codes and HVAC best practices when integrating the duct into ventilation systems.