RSAC four-spring brackets have the deflection of the springs and the cast envelope that is like an exoskeleton and protects the spring from sudden movements of stoppages and starts of the equipment or abnormal vibrations. Its anti-slip rubber base also performs the function of absorbing vibration and noise. To increase the load of these supports you can put a inner spring C99C lilac that gives 130 kg. more load with the same deflection. Comply with ASRHAE, book Applications, chap. 47, sec. 47,44, type 4 “Restrained spring isolators”.