The Clip-Seam Pipe, allows for maximum airflow efficiency. The Clip-Seam Pipe is required for through the roof ventilation along with the appropriate flashing. Constructed from 30 Gauge Galvanised Steel, the pupe has a smooth internal finish for maximum airflow efficiency. The Clip-Seam Pipe can connect at one end and work up the length to form a solid pipe. The crimped end offers a male connection to pipe or ducting.