a ventilating hood generally for use in conjunction with a heating apparatus such as a cooker a housing incorporates both a diverter and a rear support the two of which join to segregate the incoming air through a supply conduit from the outgoing air traversing through a support arranged filter and into an exhaust outlet the front wall of the housing which is spaced from the lower end of the diverter incorporates a slightly upwardly inclined deflector which directs substantially all of the air incoming to the hood upwardly and rearwardly directly towards for movement through the filter and out of the exhaust outlet and since the air is generally unencumbered by any structure in the path of its flow it moves in a rather parallel course with the arranged diverter and rapidly exits carrying the entrained fumes therewith significantly reducing the btu requirements for operation of this hood a second deflector functions in cooperation with a first named deflector and directs a minor segment of the air flow substantially downwardly for creating an air shield above the frontal portion of the heating apparatus to thereby prevent the escape of any generated fumes from avoiding entrainment with the major flow of air passing through the filter and out of the hood by way of its exhaust conduit application_number US 1872579 A description in referring to the drawings in the particular fig1 and 2 there is.