Ductwork silencer is provided in air distribution system to attenuate the noise of the air stream being delivered, i.e. the noise level of the air stream at the outlet of the silencer should be less than that at the inlet. However, the provision of ductwork silencers only may or may not be adequate to serve the intended purposes under different situations.
2. Figures 1 to 3 illustrate how effective ductwork silencers can help in reducing the noise level at different locations.