The FAMCO Start Collar is the first step when installing the system of ducts. Heating, ventilation and air conditioning ducts, also known as HVAC ducts, install between a main duct and plenum grills at the rooms in a house. At a main duct or plenum, a starting collar is installed for attaching a straight or split fitting for the ducts. Made from 28ga Galvanized steel, The FAMCO STARTC Start Collar is manufactured by FAMCO in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this collar, please refer to the FAQs above or feel free to contact us by email.