Darnit, stuck again. This time in the "vertical pipe room"...

[orb]

I attached a jpg of where I'm stuck. The only possibility I can see is these tin double doors that appear to swing, but I can't make them swing. I've tried walking the pipes, falling, everything. It's making me crazy!

Please help?
Thanks!
Orb

 

[doomed - uk]

If I remember right, you go to the double doors and there is a window round the corner of them. You use the gravity gun to lift the beam you can see that is holding the doors shut.