sentences:  To handle large inlet flows, scrubbers designed with long, narrow, rectangular throats (Figure 4) have been used.Certain types of orifices (throat areas) that create more turbulence than a true venturi were found to be equally efficient for a given unit of energy consumed ("McIlvaine Company 1974").Results of these findings led to the development of the annular-orifice, or adjustable-throat, venturi scrubber (Figure 5).