Grease extractor method

Claim 1

A method of removing grease, oil, and other contaminants from a vaporous exhaust stream in a kitchen ventilating system, said method comprising providing a housing having top and bottom walls, front and rear walls, and a pair of side walls, drawing the vaporous exhaust stream through a vertically restricted, horizontally elongated entranceway formed adjacent said bottom wall for receiving the vaporous exhaust stream, deflecting the incoming exhaust stream rearwardly over said bottom wall by means of an entrance baffle joined to said front wall and extending rearwardly from the top of said entranceway, deflecting the exhaust stream upwardly past the rearward edge of said entrance baffle by means of an upwardly projecting baffle joined to said bottom wall and extending upwardly past said entrance baffle and spaced from the rearward edge thereof, deflecting the exhaust stream forwardly over said entrance baffle and upwardly along said front wall by means of forwardly projecting baffle joined to said upwardly extending baffle and extending forwardly at least as far as the rearward edge of said entrance baffle and spaced from said front wall, deflecting the exhaust stream rearwardly over said forwardly projecting baffle by means of a rearwardly projecting baffle joined to said front wall and extending rearwardly beyond said forwardly projecting baffle and spaced above the upper surface of said forwardly projecting baffle, deflecting the exhaust stream downwardly behind said upwardly extending baffle to said bottom wall by means of downwardly projecting baffle joined to said rearwardly projecting baffle and extending downwardly past said forwardly projecting baffle and spaced from the rear side of said upwardly projecting baffle, said downwardly projecting baffle overlapping at least a major portion of said upwardly extending baffle, and deflecting the exhaust stream downwardly along the front side of said downwardly extending baffle, around the lower edge thereof and upwardly along the inside of said rear wall.

Claim 2

A method of removing grease, oil, and other contaminants from a vaporous exhaust stream in a kitchen ventilating system, said method comprising the steps of drawing the vaporous exhaust stream through a restricted opening into a chamber, therein deflecting the entering exhaust stream horizontally through the chamber adjacent the bottom thereof, thereafter redirecting the exhaust stream upwardly and outwardly of said chamber and into a second chamber disposed above said first chamber, and therein directing said stream horizontally and forwardly through said second chamber, subsequently causing said air stream to be deflected rearwardly into a third chamber, horizontally therethrough, subsequently changing the flow path of the air stream as it emerges from said third chamber to a vertically downward direction for a distance greater than the length of the flow paths through any of said first, second or third chambers, and finally reversing the flow path of the exhaust stream vertically upwardly and discharging same to atmosphere whereby during its passage through said chambers contaminants therein will be deposited in the respective chambers permitting discharge of contaminant free air to the atmosphere.

Claim 3

A method of removing contaminants such as grease and the like from air comprising the steps of imparting velocity to the contaminated air to create a vaporous exhaust stream, causing said stream to follow a complex flow path wherein said air is passed horizontally through a first chamber; thereafter reversing the direction of flow causing the air to flow in a horizontal path through a second chamber above the first chamber, again diverting the air stream to a horizontal path whereby it flows to and through a third chamber in a direction parallel and corresponding to its flow direction through the first chamber, thereafter directing the air stream into a further chamber for vertical passage therethrough in a downward direction and finally again reversinG the direction of flow of the air stream into a last chamber wherein it flows in a vertically upward path to be discharged, free of contaminants, into the atmosphere.

Claim 4

A method of removing grease, oil, and other contaminants from a vaporous exhaust stream in a kitchen ventilating system, said method comprising increasing the velocity of the stream while directing the same along a first substantially horizontal flow path, directing said stream upwardly and reversing the direction of flow thereof to direct the same along a second substantially horizontal flow path, directing said stream upwardly and reversing the direction of flow thereof again to direct the same along a third substantially horizontal flow path, directing said stream downwardly along a first substantially vertical flow path, and reversing the direction of flow of said stream again and directing the same upwardly along a second substantially vertical flow path.