Method for producing an ejector device

A method for producing an ejector device having a plurality of ejectors comprising,

• A. forming in one step a generally tubular profile rail with
• i. a substantially planar top wall,
• ii. first and second side walls,
• iii. a bottom wall with an inlet opening along the length thereof,
• iv. an inlet channel in a corner between the top wall and the first side wall,
• v. spaced intermediate walls disposed parallel to said side walls, the intermediate walls projecting from the top wall and having respective free ends terminating a short distance from said bottom wall, and
• vi. suction openings between said free ends and the second side wall,
• B. drilling holes in the formed rail along at least one straight line through said second side wall, said intermediate walls and a wall of the inlet channel,
• C. inserting ejector nozzles in said drilled holes, the nozzles having respectively increasing widths progressing from the nozzle inserted in the inlet channel,
• D. inserting a respective flap valve in each said suction opening, the flap valves being operable as non-return valves, and
• E. closing the ends of the rail by attaching an end wall to each end of the formed rail.