STC stands for Sound Transmission Class. STC is more valid for partitions and floors & ceiling assembly. The transmission class is for a frequency range of 125-4000 Hertz. OITC Stand for Outdoor-Indoor Transmission Class. OITC is more valid for windows and is tested for low-frequency (80-4000 Hertz) exterior sound. Generally OITC value for a material … Continue reading STC, OITC, IIC & NRC. BC Section 1207-Sound Transmission
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