Rectangular sound absorbers and Round sound absorbers are used for providing the absorbtion of the sound occuring in air conditioning and ventilation systems, the filling materials inside the splitters are 2 pieces of glasswools that have one surface coated with fiberglass with 50 mm thickness and 70 Class.Rectangular sound absorber whose splitter thickness is 100 mm and 200 mm.Round sound absorber whose splitter thickness is 100 mm and 200 mm.