SIZE & COMPATIBILITY - The size of sheet metal duct board takes off start collar is 7" and it is compatible with duct 7". Made in the USA APPLICATIONS - The snap collar duct board fitting is used as a main duct or plenum; a starting collar is installed for attaching a straight or split fitting for the ducts PREMIUM QUALITY - We can proudly say our products are made of high-quality galvanized sheet metal with crimped ends (snap-lock design) for easy fitting and secure connection PRACTICAL DESIGN - The duct board snap collar is used to start runs of flexible or rigid HVAC ducting. Installing a collar is the first step when installing the system of ducts
About this item: PREMIUM QUALITY - We can proudly say our products are made of high-quality galvanized sheet metal with crimped ends (snap-lock design) for easy fitting and secure connection SIZE & COMPATIBILITY - The size of sheet metal duct board takes off start collar is 7" and it is compatible with duct 7". Made in the USA APPLICATIONS - The snap collar duct board fitting is used as a main duct or plenum; a starting collar is installed for attaching a straight or split fitting for the ducts