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cracks in burn chamber core, and or leaks in thermal bench are they a health hazard? Also water...

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I am wondering if cracks in a precast core, or the cob, or both could allow gasses into the living environment. I am thinking about variations on current design, one would be precast core elevated on firebricks in a metal tub, and simply filled all around the core with pebbles/rocks sand etc for thermal mass. This would make for easy disassembly.

In this design however there is a lot more potential for cracks in the core/burn chamber to allow gasses out in to the living environment.

Is there any extra carbon monoxide risk, if tiny cracks exist that link the inside of the burn chamber with the outside of the RHM surface?

Or would the cracks simply be extra place for the air to get sucked IN to the burn process. thus keeping air traveling in not gasses traveling out.

Also, if experimenting with water heating designs, or heating large pots of water...If a LARGE amount of water should ever fall on/in to a cracked core, or thermal cob surrounding the barrel, is there any chance that this could trap moisture that would make the core or cob mass EXPLODE? Or would the h20 simply find it's way back out in the same cracks it found it's way in?

Thanks for any thoughts.
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Location: latitude 47 N.W. montana zone 6A
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Jacob; A crack that leaks will show usually show soot. if it is sucking air then your rocket won't roar properly and you will have problems with incomplete burn or your fire starting to draft up the feed tube. Anything that looks leaky should have more cobb applied. If your heater is hot and you flood it i wouldn't expect an explosion but i would expect your core to crack apart. If your cob just gets wet than you got lucky, dry it out and light it up.
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Location: Victoria British Columbia-Canada
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Every home that burns fuel, should have a carbon monoxide detector. Get one.
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