1. Industrial, not an academic setting. Researchers come and go too quickly in academia to make this work. Also, in Academia, researchers can't be fired for violating safety protocols.
2. The hood manufacturer is willing to certify that their product is appropriate for this use and will agree to replace the hood if the acid vapors result in hood failure before the end of the hood's expected lifetime (20 years?). Both the certification and warranty will, of course, need to be in writing.
3. The hood is clearly and conspicuously labeled with the materials that can be used in it and the label explicitly tells users not to use any material that isn't listed, and
4. Each user signs a statement that acknowledges what he/she can and cannot use in the hood.

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