4 Inch Duct Connector Flange, 2 Pack Metal Straight Pipe Exhaust Hose Flange for Heating Cooling Ventilation HVAC System 2.9mm(ID)x4.9mm(OD)x300mm(L) 12 X Model Round Tubing

12 X Model Round Tubing

It can be installed in a 16mm diameter hole in doors 59mm-90mm thick

8inchx10inchx3

Surface Treatment: Passivating

Cutting Edge Diameter: 8 mm(3/10")

4 Inch Duct Connector Flange, 2 Pack Metal Straight Pipe Exhaust Hose Flange for Heating Cooling Ventilation HVAC System 2.9mm(ID)x4.9mm(OD)x300mm(L) 12 X Model Round TubingDuct flanges are widely used for air ventilation systems in home, kitchen, bathroom, garage and factory etc. Specification Color: Grey Material: Galvanized Iron Interface Outer Diameter: 95 mm 3. 7 inch Diagonal Mounting Hole Distance: 108 mm 4. 3 inch Distance Between Adjacent Mounting Holes: 53 mm 2. 1 inch Base Outer Diameter: 119 mm 4. 7 inch Packing List: 2 x Duct Connector Advantages 1. The connector is made of galvanized iron, which is anti