An apparatus for noise attenuation of an HVAC&R system including an enclosure having a first enclosure frame and a chassis insertable inside the enclosure and supported by the first enclosure frame upon insertion inside the enclosure. The chassis includes a first chassis structure securing a self-contained refrigerant loop. The loop maintains a gap from the enclosure upon insertion of the chassis inside the enclosure. A second chassis structure supports the first chassis structure. At least one vibration damping device is positioned beneath the first chassis structure and between the first chassis structure and the second chassis structure. The vibration damping device is supported by the second chassis structure, the second chassis structure is supported by the first enclosure frame. The enclosure is vibrationally isolated from the loop.