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A fire door acts just as any other door in normal service, but in a fire it takes on a critical role – to save lives and protect property. It does this by holding back the spread of fire and smoke through a building for a designated period (for example 30 or 60 minutes), giving time for building occupants to escape. FD30 refers to a door assembly rated at 30 minutes fire resistance when tested in accordance with BS 476 Pt 22. It is the most common specification for fire doors leading to escape routes. FD30S relates to a door assembly that is fire AND smoke resistant up to a minimum of 30 minutes. The additional 'S' in the rating indicates that the door prevents the passage of cold smoke.