SpiroFlex pipe reducer RED200/180-OC — concentric reducer Ø200 to Ø180 mm (galvanized)

SpiroFlex concentric pipe reducer RED200/180-OC is a galvanized-steel transition piece designed to join round ductwork with diameters of 200 mm and 180 mm. Intended for ventilation, HVAC and exhaust systems, the reducer ensures a smooth change in duct size while maintaining mechanical stability and corrosion resistance. Its concentric shape keeps the airflow centred and helps preserve system balance during diameter transition.

Advantages

The reducer is fabricated from galvanized steel to provide protection against corrosion and to withstand typical HVAC environmental conditions. Its concentric design offers consistent airflow direction and reduces turbulence at the connection point. The product is compatible with standard round ducts and is engineered for a reliable mechanical fit, enabling straightforward installation and long service life in ventilation and exhaust applications.

Suitable for

• Ventilation ducts in residential and commercial HVAC systems
• Exhaust lines in kitchens, bathrooms and technical rooms
• Air distribution systems requiring a reduction from Ø200 mm to Ø180 mm
• Retrofit or modification projects where matching different duct sizes is needed

Key specifications

• Material: galvanized steel for enhanced corrosion resistance
• Type: concentric reducer to maintain centred airflow
• Input diameter: 200 mm
• Output diameter: 180 mm
• Shape: round duct transition piece
• Typical applications: HVAC, ventilation, exhaust systems

How to use

Position the larger end of the reducer onto the Ø200 mm section of the duct and secure it using appropriate clamps, rivets or duct connectors compatible with galvanized steel. Align the smaller end with the Ø180 mm duct section and fasten it to achieve an airtight mechanical connection. Ensure the reducer is installed concentrically to keep airflow balanced and inspect seals and joints for leaks after installation. For best results, follow local ventilation standards and the installation practices used for round metal ductwork.

Usage recommendations

Before installation, confirm the diameters of existing ducts and ensure all mating edges are clean and free of damage. Use corrosion-resistant fasteners and apply joint sealant or tape where an airtight connection is required. Avoid sharp bends immediately upstream or downstream of the reducer to minimise pressure losses and turbulence.