Posted: 12/13/2010 6:31:33 AM EDT
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What does this do?
You see them at walmart SAMs in this case when the doors opens the fan kicks on. Why? What does this do? I will post. Blow air before some smart ass does ;) |
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That is an Air Curtain...I am serious. Google it. ETA: In case you do not want to google it...  It keeps the air trapped inside in the building hence an air curtain. When many people go in and out of a building it helps keep the inside AC regulated. The air curtain blocks the AC air from leaving the building. |
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http://en.wikipedia.org/wiki/Air_door
i always imagined i was being disinfected from the walmart germs when I walked out... i like my idea better ,, |
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