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.
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