Detailed Product Description Hydroponics Air DuctingLength: 20ft or 25ft.Size: 4" 6" 8" 10" & 12"Temperature range: -30°C , +140°CMaxm rate of circulate: 3m/s maxm workPressure: 2500paBend semidiameter: 0.54xDDouble Thickness (L=25FT)Item No.:A=18030001, 4"B=18030002, 6"C=18030003, 8"D=18030004, 10"E=18030005, 12"With String (L=25FT)Item No.:A=19030001, 4"B=19030002, 6"C=19030003, 8"D=19030004, ...