2 x 100mm Backdraught Shutter Flap 4-inch Non-Return Valve Damper Flap to Connect Duct Pipe or Flexible Ducting Hose Backdraft Cold Air Stopper

• You will receive a pack of 2 x 100mm / 4 inch plastic ducting connectors with inline backdraught shutter / gravity damper flap. Material: PVC plastic. Colour: white. Diameter: 100mm.Prevent cold air from entering through home exhaust fan ducting using back draught shutter.
• Efficient Airflow Control: Features two 100mm backdraught shutter flaps, designed to effectively prevent backdrafts and maintain optimal airflow in duct systems.
• Universal Compatibility: Suitable for connecting with 4-inch duct pipes or flexible ducting hoses, ensuring a snug and secure fit for a variety of ventilation setups.
• Durable Construction: Crafted from high-quality materials, these shutter flaps offer long-lasting performance and resistance to wear, making them ideal for both commercial and residential use.
• Easy Installation: Designed for hassle-free setup, these non-return valve dampers can be quickly and easily installed without the need for professional assistance.
• Cold Air Stopper: Acts as an effective barrier against cold air intrusion, maintaining indoor temperature and energy efficiency, especially during colder months.

Ventilation systems are intended for air distribution in ventilation systems of flats, houses and utility buildings. Perfect for where the air should not go back, and only fresh air should remain. Pipe to pipe connection. 100mm / 4-inch Plastic Ducting Connector with backdraught shutter / non return damper flap Male Spigot will fit inside 100mmRound Pipe 102mm Flexible Hose and can be used to join multiple lengths of pipe together to form a long duct run. Stops unpleasant odours, noises, or draughts flowing back through your duct. With a gravity flap - no need for springs that break! Use when you need to stop smells flowing backwards with inducting, or when you have 2 or more extractor fans connected to same duct run. Round rigid ducting provides superior airflow performance vs. comparative size rectangular or flexible duct. Pressure Drop in Pascals: 15 l/s = 25.0 Pa - 30 l/s = 44.90 Pa - 60 l/s =101.60 Pa. Easy to install and durable, just push-fit duct and fittings together. Built to last out of high-quality white Polystyrene/Polypropylene plastic Material. Max / Min Temperature: +60c / -15c. Suitable to use in compliance with Part F Building Regulations.