Let's remember that fire rated doors must have a closer on them and that any stops must not have a hold open feature. Hinges are to be of steel construction and not bronze to stand up to the heat of a fire. Exit devices are not permitted to have a dogging feature, this is an easy open function. We don't want a hold open or easy open function on a fire rated door. There should be a positive latching function on a fire rated door that is driven closed by a closer, however, manual flush bolts are not permitted.
On double doors, a vertical astragal of stainless steel completes the metal barrier. A coordinator insures the proper closing sequence. Factory rated perimeter gaskets and sweeps provide smoke control.