This would seem to cover it.
Somewhere along the way someone, possibly a PE, possibly not, will have to look at the volume of air moved per minute by the fan(s), the size of the room, the sources of makeup air and the resulting flow pattern and make a determination that for the likely rate at which flammable material is being introduced the ventilation is enough to keep the concentration to a safe level.
I would then expect some of those calculations to be found in texts and references for HVAC.
For hydrogen, for example, an open roof without any forced air movement will probably be enough. "Adequate ventilation" does not automatically require use of fans.
Beyond that initial design, it comes down to assurances that the system is turned on and working properly when it is needed. You seem to have found discussions of that second part.