Projector

A projector, comprising:

• a light source;
• an electric optical device that modulates a light irradiated from the light source in accordance with an image information to form an optical image;
• a projecting optical system that enlarges and projects the optical image formed by the electric optical device;
• a casing having a side, the casing accommodates the light source, the electric optical device and the projecting optical system;
• a centrifugal fan disposed around the light source that draws in air by rotation thereof and discharges the air in a tangential direction to the rotation;
• an exhaust duct accommodated in the casing, the exhaust duct having a first end connected to an air discharge hole of the centrifugal fan and a second end connected to an exhaust hole formed at the front of the casing where the projecting optical system is exposed;
• and
• at least one bent portion formed on the exhaust duct to bend an exhaust stream discharged from the centrifugal fan, wherein the at least one bent portion changes the direction of the exhaust stream by approximately ninety degrees relative to the direction of the exhaust stream at the air discharge hole of the centrifugal fan;
• and
• wherein the cross-sectional area of the exhaust duct is substantially constant.