- Wild tracks
- Wild takes
- Recordings of dialog that are wild
I really swear by them. You can get usable audio in a place like that, just not necessarily out of the camera frame. Radio mics are obviously an option, but the decay of the reverb in a lav mic never sounds as good as in the boom (in my opinion at least). Take a moment and chat with the script supervisor and/or whoever on set is paying attention to script (hopefully someone) and let them know that you will be counting on consistent line readings because your wide shot takes will not be useable. This will not only help your filmed takes but will also hopefully keep your wild lines more consistent in terms of performance.
Also, capture the space in detail. Go around before or after shooting (or both) and record the natural sound sources. If there are noticeable sounds coming from the fans, buzzing lights, etc. then grab a nice, minute-long close recording of each. If you have to live with leakage from the background into your dialog — which, of course, you will — then having controlled, layered recordings of the atmosphere will help it blend and at least make the backgrounds sound purposeful. At the very least, the post guys/gals will appreciate it.
For the scenes where loud sounds happen, you might even set up a stereo pair out in the lot to catch the natural decay. I usually carry my pcmd50 stereo recorder to have on hand in case I want to quickly set up a stereo capture, if time or helping hands turn out to be scarce.
Best of luck!