Patent ID: 7513823

Claim:
A VAV box, comprising: a housing of parallelepiped configuration having a hollow interior formed by a flat top wall, a flat bottom wall, and a pair of flat side walls; said housing having an entrance at a leading end and an exit at a trailing end so that an airflow enters said housing at said leading end and exits at said trailing end; said pair of side walls having a vertical orientation and including a first side wall and a second side wall; an air flow passageway defined by said hollow interior of said housing; a flat blade mounted within said air flow passageway; said flat blade mounted on a vertical axis for rotation in a horizontal plane; a first protuberance formed on an interior side of said first side wall; said first protuberance having a leading wall that is swept back relative to said entrance to said VAV box and having a trailing wall that is swept forward relative to said entrance; said first protuberance leading wall extending into said hollow interior of said VAV box by a preselected distance that is substantially equal to a second preselected distance by which said first protuberance trailing wall extends into said hollow interior; respective innermost ends of said first protuberance leading and trailing walls being interconnected to one another by a concave wall; a second protuberance formed on an interior side of said second side wall; said second protuberance having a second protuberance leading wall that is swept back relative to said entrance to said VAV box and having a second protuberance trailing wall that is swept forward relative to said entrance; said leading wall of said second protuberance extending into said hollow interior of said VAV box by a first preselected distance that is substantially equal to a second preselected distance by which said trailing wall of said second protuberance extends into said hollow interior; and respective innermost ends of said leading and trailing walls of said second protuberance being interconnected to one another by a second concave wall; and wherein the innermost ends of the first and second protuberances are substantially aligned in the direction of airflow.