Indeed, H2 is very buoyant in air and rises extremely quickly.
However, this means that it collects and concentrates at the high points of the ceiling in an enclosed space. Typically, the garage door opener is also in that space, as well as light fixtures, etc. The garage door opener has relays with contacts. Older fluorescent lights also have contacts in the small starter. There are all sorts of ignition sources at or near the ceiling where the H2 will concentrate.
Thus, garaging a H2 fuel cell vehicle is against the regulations, for a multitude of reasons.
Having worked with liquid hydrogen in a hydrogen safe building for many years, I am acutely aware of the hazards it presents and the measures one must take to reduce the risk of those very real hazards.
Bill D.
3.) With regard to garaging, I was reading a while back that the _hydrogen is so light that it would float and disperse_ readily generating the idea a HFCEV could be garaged. If I find the article I will post it but the comments you found in a passage about getting it out and into a well-ventilated space makes me want to find an authoritative source. It may be the difference between a slow leak and something faster.
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