... 2)Bending radius is same as outer diameter Silicone hot air duct for HVAC and ventilation systemMaterial: spring steel wire ... temperature duct, as suction and blast hose, suitable for hot air , blower, exhausting gas, etc. 2.Heat resistant well Application: ... Suction and blast hose, especially suitable: -For transmission hot and cold air. -For printing machines, blowers and compressors. -For ...