anticitizen 1 help

[MSGSteveOpet]

Well, it's after the gate and ALyx telling me to run. I'm in a shaft type building and have made it to the top, but am stumped now! One or two levels down. maybe? I can get on top of the ductwork, but there doesn't seem to be any openable vents? Here is a screen shot...any help appreciated...going back and looking some more...Hooah!
P.S. here is a larger screenshot
P.S.S how is this one?

 

[DreadLord]

P.S. here is a larger screenshot

Indeed. Quite large. Almost large enough to make out nothing.

 

[8ball]

there should of been a room with sum health and a poison head crab, its not hard to miss. if u walk to the window in that room and look to your left you can see the back of sum locked double doors. on the doors there is a bar that is holding them shut, use the gravity gun to pick up the bar and move it off the doors.


BINGO the door is open

 

[MSGSteveOpet]

THANKS 8ball! Didn't see the window in the room! Will try it...Hooah!

 

[Hectic Glenn]

I got stuck there as well, i saved it one night and it kept me up for ages trying to think what to do. If only 8ball was there then
That white ladder in the middle that does nothing down on the orange pipe threw me off! pointless!