We offer duct silencers, which are normally rectangular in construction for A/C and ventilation ducting. These silencers are offered in standard dimension, which can be readily mounted on the existing duct. The silencers are offered in 500 mm and 750 mm length. Higher performance can be achieved by assembling more than one silencer in series depending on the noise level requirement. The predicted performance and the pressure drop across wide range of flow rates are available on request.