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LiftMaster LM21XPBB Extended Performance Release Device | LiftMaster LM21XPBB Extended Performance Release Device is a fire and other exit safety device that help regulate door operation in emergency conditions. Requires use of 10k electrical resistive edge. Can activate through other initial warning systems as smoke alarms. Institutional, business, commercial and facility entryway needs including safety devices. Allows use of battery back up which can also afford ancillary horn strobe devices.
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