bell mouth 500 and the swirler fan 100 are disposed at the front side of the hood body 710 the suction fan case 400 which receives the suction fan 200 and the outlet 600 are disposed in the rear side of the hood body in addition it is desirable to install a grid like guard 800 below the swirler fan 100 in this case the housing 700 having a hexahedron shape to form a space therein may be combined with the rear side of the hood body 710 the suction fan case 400 is received in the space of the housing 700 and the motor 300 and the outlet 600 are disposed at a rear side of the housing 700 to be connected to the suction fan case 400 fig5 is a perspective view of the swirler fan according to the disclosure the swirler fan 100 is configured such that a plurality of fins 104 are arranged toward the bottom of a main body at the lower side of the planer ring shape main body 102 having an opened center portion and a central opening 107 is provided with connection rods 106 to form a connection so that a shaft of the motor 300 is connected to the center and an annular band 108 with a certain height is erected vertically in between the inner side of the planer ring shape main body 102 and the connection rods 106 to the center 100 a thereof thus the swirler fan 100 of fig5 includes a center 100 a which is connected to the axis 330 of the motor 300 an annular band 108 which surrounds outside of the center 100 a a plurality of connection.