I suspect the problem is with a *powered* dumbwaiter. A bucket and a
pulley and a rope would not be regulated. Maybe the solution is to
study the definition of dumbwaiter and design something thet does not
meet the legal definition.
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I just looked it up in the BOCA national building code book, section
26. They do not differentiate between powered and non-powered units.

Hope my spelling is good enough!

We need to have a legal installation. We're not trying to skirt the
law here. It is just that I have yet to find a vendor that is willing
to build to our specifications.

Bob