Hi chapeshiel,
I had at my former workplace 2 pcs Rehm oven with vacuum system, and did not work properly. Loads of hours of downtime with servicing because the conveyor system is separated in the vacuum area from the main conveyor system, and the transition is made between them while the solder is fluid, and components can shift. We got a lot of scrap from it, faulty boards, boards (small ones) falling between the two conveyor systems, shifted components, etc.
Don't know if they have managed to find a solution for that, but if you have a meeting with them, ask them if they have a model where the conveyor system for the vacuum chamber is not separated at all from the rest of the conveyor. I certainly not recommend Rehm for vacuum, but they are the best if we speak about convection soldering.
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