Patent ID: 7128526

Claim:
A blower, comprising: a blower housing having an outlet including opposing first and second walls connecting a pair of opposing side walls; an impeller rotatable within said housing and positioned to generate an airflow through said outlet; a plurality of louvers mounted between said side walls proximate said outlet, including a first louver disposed adjacent said first wall, a second louver disposed adjacent said second wall, and at least one third louver disposed between said first and second louvers; and said blower housing movable between a first orientation and a second orientation which is inverted with respect to said first orientation and, in each of said first and second orientations, said louvers are moveable between a first position in which said louvers are positioned by contact with said airflow upon rotation of said impeller to allow the airflow to exit said blower housing through said outlet between said louvers, and a second position in which said louvers are positioned by gravity to cooperatively block said outlet when said impeller is stationary.