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The Orange Box: Portal Hints
How can I get into the vent opening?
1 of 8: It's just a bit too high to jump up into.
2 of 8: Maybe if you used a "stepping stone" item.
3 of 8: Go back to the room next to the sentry room and look around while dodging the sentry's rockets.
4 of 8: One of the chairs in there should do.
5 of 8: Pick a chair up and return to the vent opening.
6 of 8: Drop the chair on the floor next to the opening, then use it to jump up into the opening.
7 of 8: This should work even if the chair has been knocked over (though if it has, you may have trouble positioning it right).
8 of 8: NOTE: This is a "non-standard" solution, and the "right" way to do it is to get a storage cube to use as a stepping-stone item.