This anechoic measurement system is used to measure the noise performance of room air conditioners under specified ambient operating conditions, and can also be applied to the research and testing of the noise performance of various other household electrical appliances. The laboratory complies with the requirements of ISO 3745, GB 6882, GB 4214 and GB/T 7725-2004. The anechoic system adopts a double-layer sound insulation structure. The outer layer is equipped with an independent foundation, while the inner layer is isolated from vibration by damping spring shock absorbers. High-efficiency, low-resistance broadband muffler units are installed at the supply and return air outlets of the air conditioning unit for operating condition regulation. Wedge-shaped or flat-panel sound-absorbing materials are installed on the indoor surfaces.