The type of sound for each type of barrier and the ability to decrease the volume level, from which the study found that entrepreneurs can consider the category of sound barrier one. As shown from the use cases steel 24 ga sound barrier type which is effective in absorbing sound minimal. When compared to other materials. Evaluation of the level of elementary school completed Jom sound installation sound barrier case, Cap type steel 24 ga, which can measure the volume display 18. Is as follows:
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