SHUT-OFF DAMPER HI AIR KOREA(HAK) SHUT-OFF DAMPERS of naval ship are specially designed for propose use of naval ship. HAK SHUT-OFF DAMPERS are effective in isolating duct system that requires air tightness, such as working / stand-by fans. VIEW MODULATING DAMPER HI AIR KOREA(HAK) MODULATING DAMPERS of naval ship are specially designed for propose use of naval ship ships. HAK MODULATING DAMPERS are effective to regulate the pressure or air flow rate in duct system. VIEW