The mounting has been designed specifically ORS for applications where transmission of low frequency machinery vibration to a building structure must be reduced to avoid physical damage or annoyance to the the occupants. Vertical and lateral restraint is provided to control movement of the mounted equipment when subjected to external forces. This could otherwise be excessive due to the low stiffness springs required to provide isolation of low frequency vibration. Equipment located at roof level can be successfully mounted on the units as any ORS movement caused by high wind loads will be limited. Cooling Towers and chillers which contain large volumes of liquid will benefit from installation on mountings because during "draining ORS down" upward movement is restricted thus avoiding damage to pipework and electrical connections.