My work is closely related to the A/C industry and takes me into...

  1. 501 Posts.
    My work is closely related to the A/C industry and takes me into many plant rooms in many buildings and I don't know of any toxic gases in these areas that can "leak" into the A/C system.

    Yes, I'm saying that any toxic gas in an A/C system would have to be deliberately introduced.

    Let the conspiracy theories begin!!
 
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