PVC Duct FLE is simple to install and less expensive than metal piping. In comparison to some of the heavier metal pipes, they require less support because it is lightweight. The fittings are divided into numerous sizing groups, with schedule 40 and schedule 80 being the most popular. The material also has excellent chemical resistance. PVC Duct FLE with a 40 rating is typically thick, whereas 80 is substantially thicker.