It is the opening in the duct where the expansion joint is installed.

It is the opening in the duct where the expansion joint is installed.
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation u
© 2025 U.S. Bellows, Inc. | All Rights Reserved | Privacy Policy | Facilities