... high pressure, use for air ventilation in each environment.3. Round style, and easy to install oval or round connection ... Length: 10MTemperate range: -30 degree to + 200degreeAir Velocity: 28m/sWorking Pressure: 250mmAqZhaoqing Grandaire Air conditioning Co.,Ltd has been established ... been exporting more than 4 million US dollars of products to overseas markets each year, including USA, UK, Australia, ...