FM Approvals 4121
- Fire and Smoke Door Holder and/or Release Devices
- standard by FM Approvals, 04/01/2013
- Category: FM Approvals
$50.00
$25.00
This standard sets the performance requirements for fire and smoke door holder and/or release devices. They shall be examined for their ability to keep a fire or smoke door in the open position by either electromechanical or electromagnetic means until such time that the unit(s) receive a signal from an external source such as a product of combustion device or a simulated alarm signal meant to test the system.
This standard is not intended to be used to determine when or where door holder and/or release devices are used nor is it intended to be used to determine the type of detection devices to be used or where such detection devices are located.
This standard is not intended to be used to determine when or where door holder and/or release devices are used nor is it intended to be used to determine the type of detection devices to be used or where such detection devices are located.
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