Reducer external MAGNAPLAST 23280 D200/160 — duct transition 200 mm to 160 mm

MAGNAPLAST external reducer 23280 D200/160 provides a reliable transition between circular ducts of 200 mm and 160 mm diameter. Manufactured for ducting systems, this reducer creates a smooth mechanical connection and maintains alignment of airflow for ventilation and exhaust installations. It is intended for use in HVAC repairs, retrofits and new installations where a change of duct diameter is required.

Advantages

The reducer is constructed to fit externally over the larger duct end and insert the smaller duct, providing a secure mechanical joint without internal obstruction. Its dimensional design supports consistent airflow with minimal turbulence at the transition. The external mounting simplifies installation and removal for maintenance or modification of duct layouts. The part is compatible with common circular duct materials and can be combined with clamps or sealants for an airtight connection.

Suitable for

• Connecting a 200 mm circular duct to a 160 mm circular duct in ventilation systems
• HVAC repairs and retrofit projects where diameter reduction is needed
• Exhaust fan or appliance ducting requiring a step-down connection
• Temporary or permanent duct layout adjustments in residential and commercial buildings

Key specifications

• Input diameter: 200 mm (larger side, external fit)
• Output diameter: 160 mm (smaller side, inserted or fitted)
• Type: external reducer for circular ducts
• Application: ventilation and exhaust duct transitions
• Installation: external mounting, compatible with clamps and sealants

How to use

Prepare both duct ends by ensuring they are clean, straight and free of burrs. Slide the larger end of the reducer over the 200 mm duct until fully seated, then insert the 160 mm duct into the smaller end. Secure the connection using appropriate clamps, screws or duct tape as required for the material and local regulations. Apply a suitable sealant or gasket at the joints if an airtight connection is needed. Check alignment and airflow direction before restoring system operation.

Usage recommendations

For reliable performance, use non-corrosive clamps and compatible sealants, and avoid sharp bends immediately adjacent to the reducer to minimize pressure loss. Inspect connections after initial operation and periodically thereafter to ensure seals remain intact and fasteners are secure.