a collection body having a plurality of foreign object filtering chambers for filtering foreign objects and a plurality of foreign object storing chambers for storing foreign objects filtered from the foreign object filtering chambers;

a sealing member for closing a lower portion of the collection body; and

a separation plate formed horizontally at the collection body and having an exhaust member disposed at an upper side of the collection body, the exhaust member guiding airflow;

wherein the plurality of foreign object filtering chambers comprises:

a first foreign object filtering chamber disposed in an inner space of an inner wall extending to a downward direction of the separation plate; and

at least one second foreign object filtering chamber provided at an outer side of the first foreign object filtering chamber; and

wherein the plurality of foreign object storing chambers comprises:

a second storing chamber defined as a space between the inner wall and an intermediate wall spaced at an outside of the inner walk; and

a first storing chamber defined as an inner space of an outer wall spaced at an outside from the intermediate wall; and

wherein the first and second foreign object filtering chambers and the first and second foreign object storing chambers are formed as one body.