No, steel stiffeners are not required in Hollow Metal doors, they are one of many optional core available.
Per ANSI/SDI A250.8 and ANSI/HMMA 867, core construction are optional o...
The following common wiring diagrams are available:One Single Door with Panic BarElectric Latch Retraction, with Auto OperatorDelayed egress - Fire Rated ApplicationAuto Operator and actuatorElectr...
Electronic
Protocols:Access Control Door with electric trimAccess Control with electric strike Access control with electric strike and LCN 4600 automatic operatorAccess Control with remote Loc...