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       xkcd - A Webcomic - Air Handler (2753)
        
       Image:
 (PNG) air_handler.png
        
       It maintains odor levels in a normal familiar range, so if you
       open the windows and the air gets too fresh, it filters it
       through some dirty laundry samples to compensate.
        
       Comics reproduced from www.xkcd.com under license.
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