Spring isolators shall be free standing and laterally stable without any housing and complete with a moulded neoprene cup or 6mm neoprene acoustical friction pad between the baseplate and the support. All mountings shall have levelling bolts that must be rigidly bolted to the equipment. Installed and operating heights shall be equal. The ratio of the spring diameter divided by the compressed spring height shall be no less than 0.8. Springs shall have a minimum additional travel to solid equal to 50% of the rated deflection. Submittals shall include spring diameters, deflection, compressed spring height and solid spring height. Mountings shall be type SLF as manufactured by Mason Industries, Inc.