Makro Teknik L profiles have a wide range of application with their different mounting capabilities. They are used as support and connection elements for exterior coating hangers, and pipe support systems. They are produced in different sizes and thicknesses to meet customer needs. They can be used either individually or in combination with other profiles. Their holes provide easy mounting and installation. Alternative connection profiles in SMACNA and DW142 standards are given which could be used in duct systems.