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United States Department of Agriculture

Agricultural Research Service

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Image Number D752-1

Retired chemist Dave Carlson uses balloons to check airflow patterns of the air curtains positioned vertically on either side of the doorway. When positioned correctly, the air curtains will prevent the passage of essentially all flies and mosquitoes into the adjoining room.


Photo by Peggy Greb.

640 pixels wide: (d752-1.jpg)

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Last Modified: 3/14/2017
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