Why? As long as you place the unit in an area where the heat can get away, why should it be an issue? Yes, if you put it in an enclosed entertainment center with a glass door you're going to have cooling problems. But in that case you're going to have cooling problems even with cooling fans. The warning is probably just there as a "just in case".
As long as there are a few inches of space all of the way around and the air is always moving, even if just from the regular air flow within the room, why wouldn't a passive cooling system work?
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Why? As long as you place the unit in an area where the heat can get away, why should it be an issue? Yes, if you put it in an enclosed entertainment center with a glass door you're going to have cooling problems. But in that case you're going to have cooling problems even with cooling fans. The warning is probably just there as a "just in case".
As long as there are a few inches of space all of the way around and the air is always moving, even if just from the regular air flow within the room, why wouldn't a passive cooling system work?