With lighter weight construction materials used in office buildings, schools and hospitals today, it does not take much energy to generate annoying vibration problems. The SHAA and SHAB rubber and spring vibration isolation hangers are designed to provide high-efficiency isolation from structure-borne vibration for lighter point load applications. It is important the spring is adequately loaded to achieve the desired natural frequency. The SHAA provides 1" (25 mm) deflection at loads of 17 to 71 pounds (8 to 32 kg) and the SHAB provides deflection of 0.5" (13 mm) under loads of 15 to 70 pounds (7 to 32 kg). The SHAA and SHAB vibration isolation hangers are complete with molded neoprene rubber bottom caps which hold the spring in place, provide protection against short-circuiting due to rod misalignment, and isolate against high frequency vibration from fan blade passage noise. These vibration isolation hangers are shipped completely assembled and are designed to be used with threaded rod through 3/8" (10 mm) in diameter.