Air cleaner

An air cleaner, comprising:

• a centrifugal fan;
• an air flow controller disposed at an upper side of the centrifugal fan, the air flow controller being configured to adjust a direction of air that passes through the centrifugal fan, the air flow controller including:
• an introduction grill into which air passing through the centrifugal fan is introduced;
• a fan housing provided above the introduction grill;
• a circulation fan provided within a space defined by the introduction grill and the fan housing;
• and
• a discharge portion provided at an upper portion of the fan housing;
• an air guide between the centrifugal fan and the air flow controller, the air guide being configured to allow the air passing through the centrifugal fan to flow to the air flow controller, the air guide including:
• a cylindrical outer wall forming an outer circumferential surface of the air guide;
• a cylindrical inner wall positioned at an inside of the outer wall and forming an inner circumferential surface of the air guide;
• air flow path defined between an inner circumferential surface of the outer wall and an outer circumferential surface of the inner wall;
• and
• at least one guide rib disposed in the air flow path, the guide rib being configured to extend longitudinally and allow the air discharged in a radial direction through the centrifugal fan to flow upward, wherein the air guide further includes a rack that communicates with a gear of the air flow controller, the rack being provided at the inner wall, and wherein when the rack communicates with the gear, the air flow controller rotates in a clockwise direction or a counterclockwise direction, with respect to an axial direction of the air flow controller.