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Understanding ADA Door Openers - A Beginners Guide ADA-related automatic doors are split into two power classes: "high energy" and "low energy". "High Energy" refers to the more powerful of the two. Here's how the system works and what it takes to install one.  A high energy / full-powered door opens fast and forcefully on its own, triggered automatically when it senses someone approaching — think of grocery store sliders or the swing doors at a hospital entrance. Because it moves qui …