Thank you all for the very rapid response to my question.
I reviewed the MSDS for Rosco Delta Haze Fluid and it appears to be the least invasive product for producing haze. The HMIS Rating is 1 – slight hazard so I would suspect that someone with respiratory issues or who are respiratory sensitive could be adversely effected. The more confined area would of course increase the sensitivity.
Thank you, Mr. Connolly, for the suggestion of flagging the use of haze producing materials on the call sheet. I would also have the MSDS available. Consistency of the haze is also an issue and a machine such as the Rosco V-Hazer Fog Machine might be the best solution. Also, the suggestion for using “sheets of poly board to even the haze out.” That is something I had not originally considered and appreciate the suggestion.
Thank you, Mr. Lettinen, for pointing out the use of “flammable powder in air = explosion hazard” and the use of “salt crystals (pure NaCl dust)”. Salt crystals are a product I had not considered and will further research.
Thank you, Mr. Cazacu, for the suggestion of using “Leko or Joker Bug”.