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As we discussed several times at length, soundproofing your office requires an understanding of where you have noise leaks. I gave you several methods that would allow you to determine where noise is leaking in/out of your space using a stethoscope (with and without the diaphragm) to check for structure borne vs. airborne intrusions.
We discussed your having a crack by your exterior window and caulking this closed to prevent sound leaking to the other side, as well as your ceiling. Since your ceiling has tiles in a suspended grid and shares an open plenum space with the area next door, you need mass to block the sound coming over the wall through this space which is what the Privacy Shield products provide.
I recommended that you try the drop tiles first as they are less expensive, to give you the most coverage and then to add the more expensive light hood and open plenum return silencer (both with the 1lb septum) to really seal up sound from above if the problems persist.
When you asked about returning the light and plenum return silencers, I told you that they are not returnable because they are shipped in pieces and once assembled they cannot be resold as new as they are taped together during assembly.
This product is tried and true and works very well if the ceiling is the culprit. As I stated when you first called, finding the source of your noise is essential in fixing it, otherwise it’s hit and miss. Knowing where to treat will both make your solution more effective and reduce cost.