Every park we visited last week on the East Coast had these. They worked great.
I love those air curtains. This is me in WDW somewhere under the curtain.
Air curtains are pretty commonplace in a lot of stores/business in my part of the country. Every Wal-Mart in the area, for instance, uses them. They are actually pretty quiet.
I agree with the OP that this would be something worth looking in to for the parks.
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