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Quick Verdict A low-energy operator (ANSI/BHMA A156.19) opens a manual door on a knowing act, a push plate or touchless switch, and works as a normal closer the rest of the time. Pick the model by mounting side first: pull side takes a slide track arm (LCN 4631, Norton 5710, Falcon 8231), push side takes a double lever arm (LCN 4642, Norton 5730, Falcon 8242), and the Norton 5740 ships with both arms when the side is undecided. LCN 4640 handles 3… Read more