so called "air curtains"

These are those high velocity air streams that blow across open doorways such as in a mall or casino, so that things look "open" with doors in the way.
Supposedly they block transfer of inside/outside air and reduce the heating/cooling load compared to what a simple opening would create.
I have my doubts.
Anyone have any pointers as to whether these really do anything useful aside from wasting even more heating/cooling/duel/money?
Thanks
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On 1/15/2013 10:18 PM, danny burstein wrote:

Air curtains block flying insects from entering a building. The units are required by the health department in my county to be installed over the back doors of restaurants, grocery stores and commercial kitchens and equipped with a door switch to switch them on whenever the door is opened. I can only remember one grocery store that had one built in over the front entrance that ran continuously. I don't see them around anymore because women complained about their expensive hairdos being blown away along with freaked out infants and the loose contents of their shopping carts. ☺
TDD
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From what I've seen at a resort, they have a double garage door wide opening for a game room. I don't get blown away, and it's instant summer relief entering. I see one misused at a local pizza shop. They got that door thing going while consuming large amounts of air internally going up the vents, plus window fans. It might help with insects but I doubt it.
Greg
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