What is difference between the STC & OITC ratings?
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The STC rating is calculated in accordance with ASTM E413 (Originally published in 1970). It was created to provide a single number rating for interior building partitions that are subjected to noises from speech, television, radio, office equipment and other mid to high frequency noise sources. The higher the number, the better the noise isolation. The STC rating is calculated over the frequency range of 125 to 4000 hertz. The rating is calculated by comparing the measured sound transmission loss to a reference contour curve. The STC rating must only be assigned to specimens tested in a laboratory. The OITC rating is calculated in accordance with ASTM E1332 (Originally published in 1990). It was created to provide a single number rating for facades (exterior walls) and facade elements (windows and doors) that are subjected to transportation noises (aircraft, trains, automobiles, and other low to mid frequency noise sources). The higher the number, the better the noise isolation. The O