Features Made of ABS material for non-toxic and tasteless construction, ensuring safety for use in various environments. Lightweight design suitable for 4in pines, providing easy installation and compatibility with a wide range of extractor fan systems. Versatile application in kitchen, toilet, bathroom, and more, offering flexibility for different ventilation needs. Integrated gravity-based closure and seamless for leak-proof performance, ensuring efficient air control and preventing back. Specifically designed to prevent back draught and fit seamlessly between solid plastic and flexible ducting, enhancing overall ventilation system effectiveness. Features: 1、Made of ABS material material, non？toxic and tasteless 2、Light weight, suitable for 4in pines 3、Suitable for kitchen, toilet, bathroom, etc. 4、Closed with gravity, integrated forming leakproof 5、Designed to provide anti back draught, and fit in between solid plastic ducting, flexible ducting. Specification: Features: 1. Made of ABS material material, non-toxic and tasteless 2. Light weight, suitable for 4in pines 3. Suitable for kitchen, toilet, bathroom, etc. 4. Closed with gravity, integrated forming leakproof 5. Designed to provide anti back draught, and fit in between solid plastic ducting, flexible ducting. Specification: Condition: 100% Brand new Item Type: Back Draft Damper Material: ABS Plastic Caliber: Approx. 95mm / 3.7in Width: Approx. 80mm / 3.1in Height: Approx. 118mm / 4.6in Package List: 1 x Back Draft Damper Package List