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Quick Verdict Pick by the door's job. The M32 (600 lbs) is for interior traffic control on rooms, storage and hallways inside a secured perimeter. The M62 (1,200 lbs) is the default for perimeter and exterior doors and has the widest mounting range: hollow metal, wood, aluminum-framed glass, all-glass doors, double doors and gates. The M82 (1,800 lbs) is for high-risk openings where extreme forces are expected. All three run on automatic dual vol… Read more