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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 39,639
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

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An iMac is designed to run very cool. I would definitely not block or filter the bottom vent in any way as that may indeed restrict the proper air flow.

As far as keeping a computer on 24/7, there are proponents and opponents.... You can argue either way. I personally shut my machine down when I'm going to be away from it for awhile as we get thunderstorms here in Texas that sound like WW III. I also use an uninterrupted power supply that will automatically shut down the iMac in the event of a power glitch or failure.

A refurbished machine from Apple for all practical purposes is the same as a new one and carries the same warranty. If you can save money that way, by all means do so.
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