IRSTBL 4-Inch Backdraft Damper – Galvanised Steel One-Way Airflow Valve for Ventilation Systems – Spring-Loaded Duct Insert with Aluminium Flaps
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Product description
- Prevents Reverse Airflow One-way spring-loaded valve stops cold air, odours, and backdrafts from entering through ventilation ducts or extractor fans.
- Reliable Airflow Control Precision-balanced aluminium flaps open smoothly with outgoing air and close tightly against incoming currents to maintain room temperature.
- Noise-Reducing Dual Gaskets Foam seals on both sides absorb vibration and ensure a quiet, leak-free fit in dryer vents, range hoods, and bathroom fans.
- Quick Push-Fit Installation Designed for standard 100 mm (4-inch) round ducts; simply insert into the pipe for a secure, airtight seal no extra tools required.
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