Manrose 1230L White In-Line Backdraught Shutter 100mm / 4"

In-Line Backdraught Shutter – 100mm, Prevents Reverse Airflow in Ducted Ventilation Systems

This 100mm in-line backdraught shutter is designed to prevent unwanted airflow from entering ducted ventilation systems when the fan is not in operation. Suitable for horizontal or vertical installations, it ensures energy efficiency and comfort in residential and commercial applications.

• Prevents Reverse Airflow: Automatically closes when the fan is off, stopping cold air or odours from re-entering the space.
• In-Line Installation: Fits directly into 100mm (4") ductwork for seamless integration into new or existing ventilation systems.
• White Finish: Discreet and clean appearance, ideal for visible sections of ductwork where aesthetics matter.
• Spring-Loaded Flaps: Designed for reliable opening and closure with minimal air pressure loss during fan operation.
• Universal Application: Suitable for use in bathroom, kitchen, utility, or commercial ventilation systems.

Technical Specification

• Mounting: In-line within 100mm duct
• Function: Prevents backdraughts
• Material: Lightweight, durable plastic
• Diameter: 100mm (4")
• Colour: White

✅ Add this in-line shutter to your duct system to block reverse airflow and improve energy efficiency!