Sound transmission course is often a measurement of how well a reliable building material attenuates airborne noise. OITC means out of doors/indoor transmission class. It ought to be obvious what it measures from its title. Set simply, it steps noise reduction of out of doors noise within an indoor space, https://acoustic-laminated-glass21725.blogpayz.com/39073089/the-definitive-guide-to-acoustic-laminated-glass