I have been testing them and it seems that 20x20x 3 high it will seal. And this is just one sealer. I have not done vertical testing yet. But if say two sealers stacked correctly can cover a 20x20 6 high area I think large buildings are not out of the question. Unless each sealer will see the 6 high room for itself. But still 20x20 room is pretty large.
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