The SMH00-SMB side mounting bracket is used to install & secure duct in a straight run. The side mounting bracket is typically spaced at 3' or less to make a rigid & strong installation. The duct is mounted in the duct mounting bracket which in turn is bolted to the side mounting bracket using the hex bolt & washer included. The side mounting bracket is secured at the desired height to 5/8” UNC hex nuts & washers are available separately. Bracket provides side and height adjustment for various duct mounting brackets.