Air flow control device

Claim 1

An air flow control device connected to the roof of a structure for closing an opening through the roof, said control device including: a housing connected to the roof extending about the roof opening and having a bottom substantially horizontal wall spaced below the bottom of the roof, spaced side walls and spaced end walls extending upwardly from said bottom walls, each of said end walls having an outlet, said housing having passage means defining therewith a longitudinal passage extending between said outlets, said passage means having inlet means intermediate said outlets providing an inlet opening downwardly into said passage through which air may be moved downwardly from exteriorly of the roof; and an air splitter mounted on said housing and positioned in said passage having oppositely facing curved air deflector surfaces extending convergently upwardly toward said inlet from adjacent said bottom wall for deflecting air moved downwardly through said inlet in opposite directions to said outlets, said air splitter being movable in said housing and cooperable with said passage means for selectively preventing flow of air from said inlet to one of said outlets and allowing flow of air to the other of said outlets when in one extreme position in said housing and for allowing flow of air to said one of said outlets and preventing flow of air to other of said outlets when in a second extreme position.