Product Name: Galvanised Tdc Tdf Air Duct Flange Model NO.: DF-20 Certification: ISO9001 ventilation mode: mechanical ventilation Trademark: AIRMAX Transport Package: Wooden Pallet Specification: 20 Origin: china HS Code: 73269090 Product Description -- Name:Duct flange-- Thickness: 0.7 mm ~ 1.2 mm (18~24Gauge)-- Length: Depend on connection length-- Width: 20 mm / 30 mm / 35 mm / 40mm-- Available in Galvanized steel,Technical Information:1. Stamped from 16 GA & 14 GA ASTM A-653 G60/G90 material2. Manually inserted into TDF Flange3. Accepts a 3/8" carriage boltApplication :Duct corner system is a saperate flange install onto ductwork.They are used for industry, home, electric appliance, building, engine Project.Our company can supply various pulleys (OEM) according to the customers' drawings and requirements.Please offer us your enquiry with detailed drawings, specifications, unit weight, quality requirements andpictures.We will supply you not only the products with good quality but also competitive price.If you have any question , please contact us !