Round duct reducer AWENTA KO150-29 Ø150→Ø125 mm

AWENTA KO150-29 Ø150→Ø125 mm is a round duct reducer designed to join ductwork with a 150 mm diameter to ducts with a 125 mm diameter. Intended for ventilation and HVAC systems, this metal fitting provides a gradual reduction in cross‑section to preserve airflow characteristics and minimise pressure loss and noise caused by abrupt changes in duct size.

Advantages

The reducer delivers a reliable mechanical connection between two common duct diameters while maintaining a compact profile that fits into constrained spaces. Its smooth internal transition reduces turbulence and helps preserve system efficiency. The product is compatible with standard round ducting and is suitable for both retrofit and new‑build installations in residential and commercial settings.

Suitable for

• Adapting existing ventilation ducts from Ø150 mm to Ø125 mm
• Connecting fans, silencers or terminal devices that require Ø125 mm inlet/outlet
• Residential HVAC systems, kitchens, bathrooms and utility rooms
• Commercial ventilation runs where size reduction is needed for branch lines

Key specifications

• Material: corrosion‑resistant metal suitable for ventilation ducts
• Shape: round reducer with concentric transition
• Connection diameters: inlet Ø150 mm, outlet Ø125 mm
• Finish: smooth internal surface to reduce airflow resistance
• Application: designed for low‑pressure air distribution systems

How to use

Insert the larger end of the reducer into or over the Ø150 mm duct section and align the smaller end with the Ø125 mm duct. Secure both connections using appropriate duct clamps, sheet metal screws or sealant where required by the installation standards. Ensure joints are tight and supported to avoid stress on adjacent components and to maintain airtightness of the ventilation run.

Usage recommendations

Inspect mating ducts for burrs or deformation before fitting. Where possible, support the reducer close to the joint to prevent sagging and verify that the installation complies with local ventilation and fire safety regulations. For minimal noise and pressure loss, maintain smooth duct transitions and avoid multiple successive reductions in a single run.