![Guideline: Fire resistance upgrade of cultural heritage doors](/contentassets/a1f886cb1e25421ab8b0de9aff283bd1/balders-gate-5.-foto-niku-2017-1.jpg?width=560&height=315&mode=crop&scale=both&quality=70)
Guideline: Fire resistance upgrade of cultural heritage doors
A new guideline presents possible solutions for installing glass, protective boards, sealing lists, door frames and door hardware when upgrading the fire resistance of older wooden doors.