Sales haven't been brisk: About seven companies are using or testing the system, Mr. Molewyk said.

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Built from a box fan, medium-density fiberboard, lexan and aluminum, the tunnel increases airspeed by about 240 percent and cools its contents with a brisk 9 mph breeze.

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We connected Tongal with Brisk Tea, our iced tea brand, which has done a lot with video and is very much about creativity.

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