The dust load reducing device includes a main dust collecting device for collecting dust particles in the gas and a dust load reducing device installed in front of the main dust collecting device for reducing the dust load of the main dust collecting device. And a second outlet port through which a part of the gas introduced from the inlet port flows out to the main dust collector, and a second outlet port spaced apart from the first outlet port and allowing the remainder of the introduced gas to flow out to the sub-A main body having a first flow path for communicating the inlet port and the first outlet port and a second flow path branched from the first flow path and communicating the first flow path and the second flow path, And a dust separator for separating and collecting the dust particles contained in the gas according to the set inertia force and guiding the dust particles to be discharged to the first outlet and the second outlet respectively after the flow rate is increased.Therefore, in order to increase the dust, the dust load reducing device is installed in front of the main dust collecting device without additional dust collecting device, thereby collecting a part of the dust primarily, thereby reducing the dust load of the main dust collecting device, Effect can be obtained.;
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