A heat-exchange ventilation apparatus, comprising: a casing including a supply air path to supply air that is located outside a room to an inside of the room and a discharge air path to discharge air that is located inside the room to an outside of the room; a heat exchanger placed in the casing to allow heat exchange between a supply airflow that passes through the supply air path and a discharge airflow that passes through the discharge air path; a supply-air fan unit fixed in the casing to generate the supply airflow; and a discharge-air fan unit fixed in the casing to generate the discharge airflow, wherein the casing has a fan-maintenance opening portion (14a, 15a) in a bottom surface, each of the supply-air fan unit and the discharge-air fan unit includes: a fan blade to generate the supply airflow or the discharge airflow; a fan motor to rotate the fan blade; and a scroll casing, on one face side of which the fan motor is placed, the scroll casing including a bell mouth portion in another face facing the one face to admit air, the scroll casing accommodating the fan blade, characterized by at least one of the supply-air fan unit and the discharge-air fan unit is movable in an axial direction of the fan motor toward a counter-motor-side air path (16, 17) that communicates with the bell mouth portion when fixing to the casing is released, and a fan assembly that includes the fan motor and the fan blade is removable from the casing through the fan-maintenance opening portion (14a, 15a) when the fan assembly is separated from the scroll casing. a casing including a supply air path to supply air that is located outside a room to an inside of the room and a discharge air path to discharge air that is located inside the room to an outside of the room; a heat exchanger placed in the casing to allow heat exchange between a supply airflow that passes through the supply air path and a discharge airflow that passes through the discharge air path; a supply-air fan unit fixed in the casing to generate the supply airflow; and a discharge-air fan unit fixed in the casing to generate the discharge airflow, wherein the casing has a fan-maintenance opening portion (14a, 15a) in a bottom surface, each of the supply-air fan unit and the discharge-air fan unit includes: a fan blade to generate the supply airflow or the discharge airflow; a fan motor to rotate the fan blade; and a scroll casing, on one face side of which the fan motor is placed, the scroll casing including a bell mouth portion in another face facing the one face to admit air, the scroll casing accommodating the fan blade, characterized by a fan blade to generate the supply airflow or the discharge airflow; a fan motor to rotate the fan blade; and a scroll casing, on one face side of which the fan motor is placed, the scroll casing including a bell mouth portion in another face facing the one face to admit air, the scroll casing accommodating the fan blade, characterized by at least one of the supply-air fan unit and the discharge-air fan unit is movable in an axial direction of the fan motor toward a counter-motor-side air path (16, 17) that communicates with the bell mouth portion when fixing to the casing is released, and a fan assembly that includes the fan motor and the fan blade is removable from the casing through the fan-maintenance opening portion (14a, 15a) when the fan assembly is separated from the scroll casing.