(under subclass 163.1) Subject matter including (a) a passage having a region of reduced cross- sectional area connected to the mixing chamber and constructed so that the flow of a fluid through the region creates the suction, or (b) a small tube through which material is directed into a larger tube with sufficient velocity to produce the suction.
(1) Note. The passage may constitute a portion of the mixing chamber, or a low pressure region of the passage may be fluidly connected to the mixing chamber.
