I was wondering if any of you gents have done a successful retrofit of a mixing box made by Buensod. I have found a few retro kits for the boxes but they are basically just gutting the box, like this one from price.
My thought on it is to just remove the mixing damper inside the box and just put dampers on the inlet of the hot/cold ducts coming in to the box and be done with it. They are getting VFD's for the associated AHU's controlling to static also. Engineering is not wanting to get a mechanical company involved just to put these dampers in either, but I just don't see any other practical way of doing this.
Anyways, I have some pictures of what the inside of the boxes look like. Let me know what you think. Thanks!