Room partitions are used to separate interior space for work or privacy. They are used in a variety of commercial, industrial and educational settings. There are two major categories of room partitions: folding panel and accordion. For both types, specifications include dimensions, mounting style, and materials of construction. Sound transmission (STC) class is also an important parameter to consider. The STC class is a single-number rating that describes the ability to resist airborne sound transfer at frequencies 125 to 4000 Hz. Typically, the STC class is determined by measuring the transmission loss over a range of 16 different frequencies. As a rule, room partitions with higher STC ratings block the passage of more noise. STC classes do not, however, account for low-frequency sound transfers from mechanical equipment.