The Manrose 100mm (4″) In-Line Backdraught Shutter is an essential addition to any ventilation system that helps maintain indoor comfort and energy efficiency. Installed within a ducting run, this device prevents unwanted cold air, odours, and debris from re-entering the building when your ventilation fan is not in operation.

Crafted from lightweight and durable PVC, this in-line shutter is designed for quick and easy integration with existing 100mm round ducting. Whether for domestic kitchens, bathrooms, utility rooms, or commercial installations, it ensures a more controlled and hygienic air environment.

Key Features

• Prevents Air Backflow
  Automatically closes when airflow stops, blocking drafts and external air from re-entering the property.
• Energy-Efficient
  Helps maintain indoor temperatures and reduces heat loss, supporting more efficient heating and cooling.
• Low-Resistance Design
  Opens with minimal airflow resistance, ensuring that fan performance is not compromised.
• Lightweight & Durable
  Constructed from white PVC, offering reliable operation with resistance to corrosion and wear.
• Universal Fit
  Compatible with most 100mm (4″) round ducting systems, including flexible and rigid ductwork.

Technical Specifications

Attribute Specification Product Type In-Line Backdraught Shutter Duct Compatibility 100mm (4″) Round Ducting Material PVC Operating Mechanism Gravity-operated flaps Installation Inline fits between duct runs Weight (Boxed) 60g

Applications

• Bathroom extract fans
• Kitchen ventilation systems
• Utility rooms
• Inline fan ducting systems
• HVAC systems in both residential and commercial settings

Installation Notes

• Install the shutter with the arrow pointing in the direction of airflow.
• Ensure the unit is level to allow gravity flaps to close properly.
• Suitable for horizontal or vertical duct runs.
• Can be used in conjunction with extractor fans and inline fans.

Frequently Asked Questions (FAQ)

Q: Does this shutter work with both rigid and flexible ducting?
A: Yes, it can be installed with either type, as long as the ducting has a 100mm internal diameter.

Q: Will this affect fan performance?
A: No, the flaps are designed to open with minimal airflow resistance, so your fan will operate efficiently.

Q: Is this suitable for external wall mounting?
A: It is intended for use within the ducting run. For external terminals, a grille with integral shutters is recommended.

Warranty Information

All Manrose products, including this in-line backdraught shutter, are covered by a 1-year manufacturers warranty against material or manufacturing defects under normal usage and installation conditions.