Ventilating apparatus

Ventilating apparatus for ventilating a room which has tempered air introduced therein, comprising:

• an exhaust hood having an outer enclosing wall with a bottom opening and having an interior wall means defining an intake chamber within said exhaust hood terminating in the lower portion of the outer enclosure wall in a discharge nozzle means and an exhaust passageway means within said hood including a bottom fume collection chamber between the discharge nozzle means and the exhaust passageway means, air intake means for drawing air from outside the room being ventilated and forcing such air under pressure into said intake chamber, said intake chamber being constructed to form a continuous smooth walled passageway for said air to said nozzle means to create a smooth uninterrupted flow, said nozzle means forming a continuation of said chamber and being continuously smoothly curved along its width to maintain a smooth uninterrupted deflection through said nozzle means of the air introduced into said nozzle means from said intake chamber, said air stream passing upwardly through the fume collection chamber into the exhaust passageway means for drawing of fumes into the collection chamber and for upward movement of the air and fumes out of said exhaust passageway and from the room being ventilated.

Ventilating apparatus for ventilating a room which has tempered air introduced therein, exhaust apparatus comprising:

• an exhaust hood having an outer enclosing wall with a bottom opening and having an interior wall means defining an intake chamber extending along at least one enclosing wall within said exhaust hood and terminating in the lower portion of the outer enclosure wall in a corresponding extended discharge nozzle means and having an exhaust chamber within said hood and a bottom fume collection chamber between the discharge nozzle means and the exhaust chamber, air intake means for drawing air from outside the room being ventilated and forcing such air under pressure into said intake chamber, said intake chamber having front and back walls extending downwardly from the intake chamber toward each other to form a continuous smooth walled passageway of a reduced cross-section for said air to said nozzle means to create a smooth uninterrupted accelerated flow, said nozzle means having a top wall and a curved bottom wall forming a continuation of said intake chamber of a continuously reduced cross-section to a discharge slot to maintain smooth uninterrupted deflection and acceleration of the air and a relatively thin air stream passing through the collection chamber into said exhaust chamber.

Ventilating apparatus for ventilating a room which has tempered air introduced therein, comprising:

• an exhaust hood having an outer enclosure defining a bottom opening, a collection and exhaust chamber above said opening and including an exhaust filter in one wall of said chamber, and said chamber having a smooth walled air intake passageway extending vertically from the upper portion of the enclosure downwardly to the bottom portion of the enclosure, means for forcing air under pressure into said intake passageway, a nozzle means connected to the lower end of the passageway and forming an extension of said passageway, said nozzle means including an essentially shallow U-shaped bottom wall having a back wall portion extending downwardly and forwardly toward the chamber to a front wall portion extending upwardly and forwardly to the chamber to maintain a smooth uninterrupted deflection of the air from said intake passageway into said collection and exhaust chamber and defining a laminar flowing jet having a flow path essentially extending across said chamber and upwardly to engage the filter substantially perpendicular and defining a pressure condition for drawing air upwardly through said opening, and said front portion of the nozzle means directing said flowing jet to engage the filter in substantial upwardly spaced relation to said bottom opening.