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Internal exit device reinforcements are construction options to a steel door.
When the required exit device preparation is specified and ordered with the door, the door usually would include the internal reinforcements
When ordering the door, an option does exist for "Thru-bolt" attachment
To rectify a field problem, assuming the door did not have adequate (or lacks) internal reinforcing and/or the device was only attached with sheet metal or machine screws, the device should be re-installed using either Thru-bolt or Sex bolt attachment.