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Classic II Question

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It is probably a good idea to at least stick something rigid like a bit of wood or stiff cardboard underneath it to allow ventilation. A table would be ideal of course!

Blocking vents on compacts is generally not good as it may lead to overheating.

 
If the vent in the floor of the Classic's/Classic II's bucket were the only vent, as is the case with the slot-loading iMacs, I too should say, "Doan dooit". However, there is also a vent under the display and a vent near the bottom of both sides of the bucket of these AIOs, so it is less dangerous/restricting than it might otherwise be to stand one on a carpet. Depending on the depth of the carpet's pile, there is still the chance, though, of picking up more dust bunnies than would otherwise be the case.

de

 
If the vent in the floor of the Classic's/Classic II's bucket were the only vent ... there is also a vent under the display and a vent near the bottom of both sides of the bucket of these AIOs
There is also a vent in the handle. As we discussed on another thread, the fan inside the Classic creates that positive airflow you espoused.

Given the way the fan is mounted directly over the air-scoop, I would wonder if all but the very bottom vents aren't actually air exhaust vents, including the ones on the sides. In which case, keeping the bottom clear and avoiding carpeting or other soft surfaces would be preferable.

 
I doubted my own remembrance that the Classic's/Classic II's fan was placed horizontally in the front bottom of the chassis, but when I just a moment ago undressed a Classic, there it was. Ventilation is patently 'positive', in that the fan is pushing air into the case from the bottom-most vent, as you wrote, and exhausting through the other five vents. Of course, the Classics would be amongst the few Macs to use positive ventilation rather than an exhaust system. Airflow from any of the escape vents is not even palpable in the case of the Classic II I have running beside an SE/30 at the moment. The SE/30's exhaust stream is quite forceful, by contrast.

Given all of the above, putting either Classic on anything but a hard flat surface should be a no-no, because it will potentially throttle the supply of cool input air. If macintoshman wishes to do low-level (groan ...) work with his Classic II, all he needs is a stiff 10" x 10" board to slip under it. However, the caveat about dust bunnies still holds.

de

 
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