Aluminum Flexible Duct Semi-rigid Aluminum Duct Insulated Flexible Duct kitchen flexbile Duct Aluminum Flexible Pipe Aluminum Flexible DuctSemi-rigid Aluminum ... °C to + 250°C5,Operating presure -2000pa (max)6,Air velocity -25m/s (max)7,Standard length-1.5m , ... pressure central HVAC system and ventilation ,cooling,exhaust and air conditioning heating system. Diamater Thicknessmm(Inch) mm2”500.083750 ...