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How Air Curtains Work

Author's Note

I admit it: I'd never heard of an air curtain before writing this article. But now that my consciousness is raised, I see them everywhere. "Oh, is that what that blast of hot air is every time I walk inside the local supermarket?" I think. And there's another at the dentist's office. It turns out there's been a silent revolution in entrance gasket technology going on all around us, every day, unnoticed. Join the revolution or be left in the cold, inefficient dust.

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