This PVC'd duct is manufactured with fire resistant properties. Extra thick wear strip is designed to handle the toughest ground dragging applications and extends the life of the duct by preventing wear through. Super strong wire high tensile spring steel will not easily bend, deform, or crush. Heat sealed seams create a smoother surface for better air flow. Works in temperatures ranging from -0 to 185 degrees F. It has strong resistance to mild acids, alkaline, alcohols, hydrocarbons, mineral and vegetable oils, oxidizing agents and solvents with low parity.