These general rules are the distilled wisdom of confined space operations, consolidated from many sources, and with the exception of the first rule, they are not in any particular order.
Since flame-resistant (FR) clothing for petrochemical and utility workers has become the rule rather than the exception, you may be faced with a bewildering array of garment and fabric choices.
With the duties of IHs broadening, a name reflecting new environmental and safety responsibilities would clarify the profession to outsiders, say many IHs.