I've never heard of any industry standard preventing such a thing. There are a few questions this raises though. The first and most obvious being, are you sure that a "booster setup" will actually help? Have you done a site survey to figure out how to actually accomplish what you need to accomplish? The other question is whether perhaps the issue he has is with the specific "booster setup" chosen. Perhaps there's something naughty about it, in particular, that has caused him to not want it in his facility (cheap Chinese radios are known, for example, for polluting the spectrum outside of the frequencies that they are designed to operate within.) Maybe he has other folks doing legit RF stuff in there and doesn't want to risk that pollution?