The ANSI/BHMA 156.19 for Power Assist & Low Energy Power Operated Doors, was developed by the Builders Hardware Manufacturers Association. Requirements in this standard apply only to swing door operators. The operator types are power assist, and low energy power operators, for pedestrian use, and some small vehicular use. The activation of all doors described in this standard requires a knowing act. You will find a variety of knowing act devices in the Accessories section.
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