The devices are not designed/intended for doors less than 1 3/4" thick. A 1 3/8" thick door is usually a residential grade door not intended for commercial grade products like the panic devices. The doors are not reinforced the same or in the same areas on residential vs commercial doors. As long as Customer understands this and the opening is NOT a fire rated opening the device could be mounted but a shim kit/ GBK would be needed to make up for the door thickness. If the device is an exit only then the shim kit is not required.
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