The open springs RSL are the solution to eliminate noise and vibration of the equipment supported to floor, the great deflection of the springs (1 in) makes them very good eliminating high vibrations and many low frequency, as well as noise. Their simplicity makes them very economical and practical for installation. These supports can increase their load range by adding an inner spring C99L lilac color that gives 130 kg. more to the same deflection. Comply with ASRHAE, book Applications, chap. 47, sec. 44.47, type 4 “Restrained spring isolators”.