It is the responsibility of the relevant door manufacturer to provide test data and advise on the construction they used to meet the desired fire performance with their door sets/assemblies.  The door details Siniat provide are recommendations to form framed openings to support the door weights as outlined in the site-specific project pack and the GTEC Drywall Manual, these should be checked and be confirmed as being suitable by the selected door manufacturer.

The approach that Siniat have always taken and continue to take, are as per the recommendations set out in the EN Standards section 13 of EN 1634-1 which is detailed on the extract below, the design responsibility as with any project lies with the respective designer / architect.