... as outer diameter Silicone hot air duct for HVAC and ventilation systemMaterial: spring steel wire, glass ... Specification: 1.high temperature duct, as suction and blast hose, suitable for hot air , blower, exhausting gas, ... : -For transmission hot and cold air. -For printing machines, blowers and compressors. -For exhausting gas, engine construction, engine warming, aircraft construction and military ...