You can also just put the urns on the vents like the tutorial tells you. I guess it's possible to fail all the perception checks and not see any of the vents, but very unlikely. Once you know the location of a couple of the vents, it's pretty trivial to figure out where the rest should be, and there's a ton of leeway for covering the vents.
And if you mess all that up, then yeah, you can just dash through it. I don't really understand what's painfully slow about it.
