A ventilating apparatus comprising: a housing which forms an air supply flow passage for introducing outdoor air into a room, and an air discharge flow passage for discharging room air to outdoors; an air discharge fan provided to the air discharge flow passage for discharging the room air; an air draw-in fan provided to the air supply flow passage for drawing-in outdoor air; a guide duct having a duct frame for changing an air draw-in direction of the air being drawn into the air discharge fan and an air discharge direction of the air being discharged from the air discharge fan, and a sound absorbing member of a band absorbing material provided to an inside surface of the duct frame, wherein at least one of the air discharge fan and the air draw-in fan includes; a fan housing having a blade assembly rotatably mounted therein, a shroud provided to both sides of the fan housing for guiding the air to the blade assembly, and a motor mount coupled to the shroud to have a motor assembly mounted thereto for supplying rotating power to the blade assembly, characterized in that the motor mount includes; a motor plate for supporting the motor assembly, a plurality of spacing portions provided at an edge of the motor plate each with a height of step for spacing the motor plate from the shroud by a fixed distance, and coupling portions connected to the spacing portions and mounted to the shroud, wherein the motor plate includes an inward cut-off portion formed in the motor plate between each of the spacing portions for enlarging a flow area of the air being drawn into the shroud. a housing which forms an air supply flow passage for introducing outdoor air into a room, and an air discharge flow passage for discharging room air to outdoors; an air discharge fan provided to the air discharge flow passage for discharging the room air; an air draw-in fan provided to the air supply flow passage for drawing-in outdoor air; a guide duct having a duct frame for changing an air draw-in direction of the air being drawn into the air discharge fan and an air discharge direction of the air being discharged from the air discharge fan, and a sound absorbing member of a band absorbing material provided to an inside surface of the duct frame, wherein at least one of the air discharge fan and the air draw-in fan includes; a fan housing having a blade assembly rotatably mounted therein, a shroud provided to both sides of the fan housing for guiding the air to the blade assembly, and a motor mount coupled to the shroud to have a motor assembly mounted thereto for supplying rotating power to the blade assembly, characterized in that the motor mount includes; a fan housing having a blade assembly rotatably mounted therein, a shroud provided to both sides of the fan housing for guiding the air to the blade assembly, and a motor mount coupled to the shroud to have a motor assembly mounted thereto for supplying rotating power to the blade assembly, characterized in that a motor plate for supporting the motor assembly, a plurality of spacing portions provided at an edge of the motor plate each with a height of step for spacing the motor plate from the shroud by a fixed distance, and coupling portions connected to the spacing portions and mounted to the shroud,