Description:1. ABS plastic have a good hardness and it is extremely lightweight.2. It also have a good resistance of acid and alkali.3. A design with thinner top and thicker bottom can make this vent much convenient to connect.4. Internal arc design reduces wind resistance.5.Widely used on bathroom or kitchen extractor fan, In-line extract fans or cooker hoodSpecification:Material: ABS PlasticConnecting Part Dia: 100mm / 3.94 InchTop Outer Diameter: 98mm / 3.86 InchBottom Outer Diameter: 135mm / 5.32 InchHeight: 50mm / 1.97 InchMounting Hole Centre Distance: 105mm / 4.13 InchApprox Weight: 46gPackage Content:1 x Duct Connector.