DUST COLLECTING FILTER, DUST COLLECTING DEVICE, AND INTAKE DEVICE OF GAS TURBINE

A large capacity HEPA filter (10) is produced in which a layered filter medium (12) unitarily formed by an upstream non-woven fabric which can remove 70 to 90 % of 0.3 mu m particle and a downstream non-woven fabric which can remove 99.9 % of 0.3 mu m particle or more is provided and a shape of a layered filter medium is a minipleat shape in a thickness direction and an entire shape in the thickness direction is a plurality of continuous Vs. Also, a dust collecting device having such a large capacity HEPA filter (10) is produced. An air intake device for a gas turbine is provided with such a dust collecting device. By such an air intake device for a large capacity HEPA filter (10)/a dust collecting device/a gas turbine, it is possible to maintain a highly efficient dust collecting performance even though the device is small.