Flanged joints are created by bending the tip in the raw duct or fitting to create a ¼” flange. Under would be the code section for the Intercontinental Mechanical Code to the authorized welded duct connections styles. Round tubular style maintains structural integrity appreciably extended than a rectangular welded steel https://commercial-kitchen-extrac34566.dm-blog.com/36865046/commercial-kitchen-extract-systems-for-dummies