SUSPENTION TYPE VENTILATING DEVICE

PURPOSE:To provide a suspention type ventilating device fitted with a muffler effective with simple structure. CONSTITUTION:A suspention type ventilating device is fitted with a muffler formed of a casing part 3 around an axial blower 15, and duct parts 12, 3 for an air inflow port and an air outflow port. In this case, the muffler is of double structure formed of inner cylinders 10, 11, 12 and outer cylinders 4, 5, 6. The inner cylinder is a cylinder of circular cross section formed of porous material, and the outer cylinder is formed of a cylinder of elliptic cross section. A space between the inner cylinder and the outer cylinder is filled with sound absorbing material or left as a cavity, or the inner cylinder is covered with sound absorbing material of appropriate thickness.