Backdraft Shutter/Coupler - for Ducting - (1 Pack) Fans - 100mm 4'' Round PVC - Vent - Back Draft

• This reduces heat loss when extracted is not space
• Prevent animals from entering through the ducting
• verticaly or horizontaly
• Reduce noise and odours from entering through pipe

Channel size 100mm (4") plug with back draft damper for round This anti-back design coupler can be used in line with pipe etc. prevents cold hands while vented possible in the pole core ventilation room air can be exhausted when the fan is in operation. In addition, this reduces heat loss when space is not gained. Prevent animals entering through the ducting system. Work as a normal coupling on a length of ducting system. Reduced noise and fragrances from input by DUCTING Application supply and ventilation of various premises. Connection of the same diameter air ducts. White plastic design with white or grey flap. Equipped with a backdraft damper for backflow prevention. Suitable for direct installation in Air Duct, and secured with clamping ring or a corresponding tape such as tape or aluminium. Connector diameter: 100 mm. See schematic for more information and dimensions