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In the old house we had just one CAV66, positioned at the top of the rack. In the new house we're going to have 3 of them. I'm curious how much spacing others have used between multiple units. The rack will be in the same air conditioned space as the rest of the lower level. It's possible there will be additional ducting to exhaust heat from the space. My question is whether it's OK or a known bad idea to rack them on top of each other. Beyond the usual 'heat kills electronics' advice, I understand that already. I'm looking for specific advice related to these units.