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You don't. It's a reasonable assumption that the boardroom is gas-proof (unless Molluck intended on killing his constituents as well). I feel like once you reach the boardroom, the race to outrun the gas becomes irrelevant, especially considering it only takes a few extra seconds to gib the executives and end the game.
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Since only Mudokons are affected by the gas, not Sligs or Glukkons, having the boardroom excluded from its effects is pointless. The only reason the Glukkons would have a gas-proof boardroom is if they realized the full potential of Mudokon farts.