Dry Wall Ceiling System Main Channel It is also known as Carrying Channel or C Channel and is used for ceiling framework. Main Channel is a prominent channel in a conventional metal framework and it is produced from cold roll formed steel. Main channel is the supporting component for the furring channel as it hangs from the roof with furring channel right beneath it. This structure is commonly used for the drywall grid. Furring Channel It is secondary to the Main Channel as it is fixed to it. Once this process is over, the gypsum board gets screwed to conceal and finish the ceiling. FSP Furring Channel is a hat-shaped corrosion – resistant framing component used to fur out masonry walls and ceiling assemblies. In concrete wall applications, furring channel is installed vertically to the wall surface using concrete nails or power-driven fasteners. Perimeter Angle (Flat & Folded) A perimeter component for ceiling framework and it is easily connected to the wall. It is a 90-degree Galvanized Iron (GI) angle used in the inner framework. Installation The Furring channel and Main channel form the main grid for drywall ceiling, the perimeter angle is then placed on the edges to close the grid in a neat manner.