Mechanical & Motion Cooling Fan
4″ Backdraft Damper, One-Way Airflow Ducting Insert with Spring-Loaded Folding Blades for 4” Ducting in Range Hoods and Bathrooms Fans
Features:
Backdraft damper for insertion into 10-inch ventilation ducts. The backflow damper opens and closes automatically. It has a strong spring and can be installed either horizontally or vertically. The flap is suitable for retrofitting since it is completely inside the duct
Duct draft stoppers prevent cold air or wind from entering the ventilation pipe. In this case, the flap is installed in such a way that the flap leaves only open into the outgoing air direction. This means that no cold air/wind or smell can penetrate the ventilation pipe from the outside.
The backflow Preventer valve is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to vertical installation.
Specification:
Material: Galvanized Steel
Diameter: 4 inch/ 100mm
Length: 3.5inch/ 88mm
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