CSC manufactures extraction ducting from PVC and PPs. We can custom produce circular or rectangular-shaped lengths. While a rectangular duct can be a space saver it is expensive as it needs to be custom fabricated. Round duct is generally available off the shelf in most sizes. The most commonly used material is PVC due to its chemical resistance properties. PPS can be used where the duct is exhausting high-temperature fumes (between 60° and 100° degrees Celcius) as it has better temperature resistance but a similar chemical. resistance to PVC.