Based on these calibrated data, the times after which the concentration of smoke at each
of the six distances drops below the guidance levels were determined. These Guideline values
are summarized in Table 2. Graphs showing the change in concentration at each location with
time are presented in Figures 7 through 10.
C.
How to Use the Time-and-Distance Guidelines Table
For various distances from the cue release point, Table 2 provides the time (in seconds)
after the end of the cue release after which the glycol concentrations will have fallen below the
guidance levels. Thus, in order to prevent peak exposures to actors, the blocking and
choreography should be arranged such that actors are not situated within a particular distance
from the front of the smoke release point until the amount of time listed in Table 2 has elapsed
following the end of the cue. For example, if a production is using the Delta 3000 at a 50%
setting with Stage & Studio fluid, an actor should not be situated within five feet from the front
of the cue release point until at least 50 seconds following the end of the cue release; an actor
should not be situated within 10 to 15 feet from the front of the cue release point until at least 33
seconds following the end of the cue release.
It should be reiterated that the Time-and-Distance Guidelines provided in Table 2 are
intended to allow a production to use the Delta 3000 without conducting monitoring. However,
these Guidelines may not be appropriate for all productions. Table 2 is based on the Delta 3000
being positioned between four to five feet above the ground, and being operated to achieve 30 to
60 seconds of continuous smoke generation. Productions may want to use different
configurations for positioning the machine (e.g., different heights), provide on-stage ventilation,
or generate smoke for a shorter or longer period of time. In addition, many productions may
have other stage-specific conditions (e.g., on-stage activities and props that enhance dispersion)
that would allow actors to be present in areas that are restricted under these Guidelines but
which, in fact, do not exceed the guidance levels. In those cases, production-specific monitoring
would be recommended to determine whether peak exposure may occur. For the fluids included
in this testing, the calibration factors summarized in Table 1 can be used.
ROSCO DELTA 3000
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