Fire Doors Repair and Replacement
Often abused or propped open fire doors take a lot of abuse but are vital to the safety of people in the building. Under the Regulatory Reform (Fire Safety) Order 2005 these are classed as installed fire safety systems which should be inspected and maintained.
Some fire doors can offer up to 4 hours fire resistance to prevent smoke and fire from spreading throughout a building. In most cases doors are rated between 30 & 60 minutes which is usually more the enough time to escape the building without undue harm. However, damaged or propped open doors may offer little or no resistance to the spread of fire resulting in compromised fire escape routes.
Keeping doors in good condition is not a job for an amateurOur experienced team can provide a
- What Makes a Fire Door?
- Can Fire Doors be Left Open?
- What Are Fire Door Seals?
- Are All Doors Fire Doors?
- Glass in Fire Doors
Fire Doors have a specific function
They are designed to restrict the spread of smoke and fire for a specified amount of time; any thing from 20 minutes to 4 hours.
They are of robust (sometimes solid) construction, have to be installed with three hinges with minimal gaps all round. Any door furniture, handles etc. must be fire rated.
They should fit snugly into the door frame. The gaps between the fire door and frame should ideally be 3-4mm along the top and down the sides; the gap at the bottom should ideally be less than 10mm. Anything more and the door may need to be adjusted or at worst replaced.When fitted door closer's should close the door fully into the frame when let go from about 100mm.
It is possible to have open fire doors
There is usually some confusion with this question.
A fire door within a building may not always be closed. Hotels for instance have door in corridors held open during the day and closed at night.
If they are held open then then they should be able to close when the fire alarm sounds; there are numerous devices on the market which do this. But this is only suitable when a fire alarm system is installed.
Final exit doors
These are the emergency exit doors leading outside. Security aside there are times when these can be left open to aid ventilation etc.
Careful consideration should be given the issue of security before leaving these door open
Fire Door Seals
There are two types of seals that can be used on fire doors; Intumescent and Cold Smoke seals
These look like a plastic strip usually embedded in to the door or frame. These are designed to expand when exposed to heat filling the gap between the door and frame.
It should be noted that smoke may pass around these until the heat reaches a certain temperature.
Cold Smoke Seals
Not every door is fire rated
Modern fire doors.
All new fire doors will (should) be marked
Nominal fire doors
Older doors which are not marked or certified are classified as a ‘Nominal Fire Door’. This is a door which in the opinion of the assessor will hold back a fire for a period of time. These can be identified by the thickness of the door leaf, a minimum of 44mm thick. Older doors would also have been fitted with closer's or self closing hinges where necessary.
Replacing the door leaf alone will still only provide a ‘Nominal fire door set’ as the frame and leaf have not been tested together.
Must be fire rated?
Glass in fire doors should be able to remain in place during a fire to prevent smoke and flames spreading. Non-fire rated glass will crack and eventually fall out.
Modern GlassGlass in fire doors should have a visible etched mark, which will have a brand name such as PYROGLAS
Georgian Wired Glass
Older doors may have Georgian Wired glass fitted. This can be identified by the thin strands of wire running through it. The wire ensure the glass does not fall out when subjected to heat.(/p>
There is no need to change this unless it is damaged in any way; cracks and chips will mean the glass will not preform as expected.