HDB fire-rated doors are mandatory for flats where the main entrance is located within three meters of a lift lobby or staircase, or if the original flat was already equipped with one. These doors, which must have a minimum fire resistance of 30 minutes, are designed to contain fire and https://hdb-fire-rated-door-260-232086.free-blogz.com/84372133/hdb-fire-rated-door-260-27