PDP-11/34 filter and cable routing questions

Henk and Jay, Thanks for your comments. It's odd that this isn't in any of the FMPS anywhere (that I have seen). I can't help but think there must have been some Field Service maintenance procedure (and thus document) or training document somewhere that addresses this. I would imagine this was a typical PM checklist item. OK, so the filter OUTSIDE of the velcro, between the panels and the box frame, makes sense. You can see on mine that there are 4 velco strips. I don't see any evidence of a retaining bar, as Jay mentioned, though that makes sense. Also in the picture of my as-found filter, there is a hole on the left that looks to have been cut rather than decayed. I wonder if some cable routing was done through that? The ribbon cable needs to attach to the left of the programmer panel, though I'm not sure how it's supposed to leave the box. The power and display cables route I can't use the condition I found this in to determine if the filter was half height (Henk's case) or full height (Jay's). I agree that the filter doesn't seem to actually do much. Especially in my case where I don't have a top to close the box anyway. I'm just seeing how close I can get to factory-fresh conditions. Thanks for all the comments. John