IS 9901 Pt.9-1986
建筑物和建筑構件的隔音測量 第9部分房間到房間的空氣傳播隔音的實驗室測量上面有通風系統的懸吊天花板
Measurements of sound insulation of buildings and building components Part 9 Laboratory measurements of room-to-room airborne sound insulation of suspended ceilings with ventilation systems above them