... and fast delivery. Oil,Acid, Alkai&high temperature resistant&fire-retardant PVC Good price,fine quality,satisfying servicePVC flexible duct:/air ... duct 1,Material: PVC flam-resistant static-free fabric with steel wire reinforced.2.PVC Thickness:0.3mm-0.45mm.3,Diameter:4" to ... duct 1,Material: PVC flam-resistant static-free fabric with steel wire reinforced.2.PVC Thickness:0.3mm-0.45mm.3,Diameter:4" to ...