@jfmezei Raised floors are still very much a thing... no hard rule about how to arrange HVAC/power/data. Frankly it's religious. I'm indifferent to AC power location and raised floors, but data and -48VDC should be up, and I'm a proponent of cold-aisle containment, rather than hot aisle containment.If it's on slab, everything's from the top. Most facilities I'm in are simply hot/cold aisles, no containment. I've yet to have an elechicken do the lighting the way I want in the facilities I design: vertical light strips on the wall at human-height. Sure - It's hard to look down the aisle, but it's really easy to see inside the rack.