What is Outside-Inside Transmission Class (OITC) Rating?
The Outside-Inside Transmission Class (OITC) Rating is used to classify the performance of glazing in exterior applications. It is based on ASTM E-1332 Standard Classification for the Determination of Outdoor-Indoor Transmission Class. While STC rating is based on a “white noise” spectrum, this standard utilizes a source noise spectrum that combines aircraft/rail/truck traffic and is weighted more to lower frequencies.
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