Recently most of the sold diesel generators were equipped with acoustic enclosures (canopies). The purpose is to reduce the noise coming from the generators to a level that is safe for human ears as per OSHA standards. One challenge here is that this noise is coming from different sources within the diesel generator and with different frequency spectrum and amplitudes. the other challenge is that when the enclosure is dropped over the diesel generator unit it should be designed to allow for the air to flow freely in order to coll the unit and supply the necessary air for combustion, this is not easy as you have to reduce the noise and at the same time allow the air to flow without causing loss of pressure across the enclosure. This course will explain the sound engineering background required for this problem and then it will cover the noise criteria, noise absorption materials and criteria to select which material. Then the course will talk about the design of enclosure to meet the noise criteria, select the right exhaust silencing and design the attenuators to achieve the noise attenuation and maintain the pressure drop.