Reducer Ø100–125 mm white, Vrige model 10128261, duct/ventilation connector

Vrige reducer Ø100–125 mm in white is a round ventilation duct connector designed to provide a secure and tight transition between duct sections with 100 mm and 125 mm diameters. Intended for HVAC installations in residential and light commercial settings, the reducer helps maintain continuous airflow while minimising leakage at the joint. The product is made to fit standard circular ductwork and is finished in white to blend with common vent components.

Advantages

The reducer delivers a direct mechanical transition between two common duct sizes, reducing the need for custom fittings. Its round profile ensures smooth airflow with minimal disturbance at the connection point. The white finish offers a neutral appearance suitable for visible ductwork and can simplify installation alignment by providing clear edges for seating ducts. The design focuses on reliable sealing to help preserve system efficiency.

Suitable for

• Connecting round ventilation ducts from 100 mm to 125 mm diameter
• Residential HVAC systems, such as bathroom or kitchen exhausts
• Light commercial ventilation where circular duct transitions are required
• Repair or modification of existing ductwork to adapt different fan or grille sizes

When it may not be suitable

This reducer is intended for use with circular ducts of the specified diameters; it is not suitable for rectangular or oval duct profiles without additional adapters. It is designed for standard domestic and light commercial airflow conditions and may not be appropriate where high-pressure industrial ventilation, abrasive particles, or elevated temperatures are present.

Key specifications

• Material: durable plastic (white finish)
• Connection type: round-to-round duct transition
• Compatible diameters: 100 mm and 125 mm
• Application: low- to medium-pressure ventilation systems
• Typical mounting: push-fit or secured with clamps/sealant as required

How to use

Ensure both duct ends are clean and free of debris before fitting. Slide the 100 mm and 125 mm duct ends into the reducer until seated evenly. Use an appropriate clamp, screw, or HVAC-approved sealant to secure each connection and maintain an airtight joint. Check alignment to prevent kinks or bends that could restrict airflow, and perform a visual and functional test of the ventilation system after installation to confirm there are no leaks.

What to consider before purchase

• Verify that your ducts are circular and measure external diameters to confirm compatibility with 100 mm and 125 mm sizes.
• Consider the operating pressure and environment to ensure plastic construction and design are suitable.
• Plan for the required fixings or sealants to achieve an airtight connection.

Usage recommendations

For best results, use the reducer in conjunction with standard duct clamps and silicone or HVAC-approved tape at joints. Avoid using this connector in systems with high temperatures, corrosive gases, or heavy particulate load without consulting ventilation standards or a qualified technician.