The Difference Between an E and an EI Door

Fire doors are a critical component of any building’s fire safety system. They are designed to prevent the spread of fire and smoke, provide a safe evacuation route for occupants and allow for the safe entry of the emergency services.

The Difference Between an E and an EI Door

Fire doors are a critical component element of any building’s fire safety system. They are designed to
prevent the spread of fire and smoke, provide a safe evacuation route for occupants and allow for the safe
entry of the emergency services. When looking for fire doors, there are two key terms to consider: “E” and
“EI.” This infographic simply and visually explains the difference between these two fire resistance ratings
and why they’re important.

E Doors: Integrity

The “E” in fire doors denotes a fire integrity performance. They are used for fire compartmentation, designed
as a physical barrier in strategic areas of a building to slow the spread of flame and smoke and to provide a
safe exit route in the event of a fire. While it provides an effective barrier against smoke and flame, it does
not prevent the transmission of heat.
The E classification offers the necessary fire performance to meet the UK Building Regulations and are
typically found in public buildings, such as schools and offices and must be easily accessible and provide a
clear path for occupants to escape.

EI Doors: Integrity & Insulation

The “EI” in fire doors stands for Integrity and Insulation. The EI classification offers an increased level of
protection. As well as providing an integrity barrier and compartmentation against smoke and flame, EI also
delivers a significant reduction in the amount of heat transferred through the door, keeping the average
temperature of the unexposed side to below 140°C.

These doors are designed to provide insulation against heat and smoke, which can help to prevent the
spread of fire throughout a building. EI doors are typically found in more critical areas of a building, such as
server rooms, where a fire and radiated heat could cause significant damage. The higher the number
following the EI (e.g.EI30, EI60), the greater the level of fire resistance provided by the door. EI doors can
aid in providing a safe refuge area, protecting lives until safety reaches them. EI performance is also
important in the protection of property, reducing the risk of combustion in adjoining areas and therefore
reducing the spread of fire from one contained area to another.

Why Fire Resistance Ratings are Important

Fire resistance classifications are important as they indicate the level of protection provided by a fire door.
When selecting fire doors for your building, it’s important to understand the required fire resistance
performance for each location. E doors should be used in areas where occupants may need quick
evacuation, while EI fire insulation doors should be used in areas where the spread of fire and smoke must
be prevented from the added risk of transmitted heat.

Fire doors can slow the spread of fire, allowing time for occupants to evacuate and for emergency
responders to arrive. The added protection can make a significant difference in the outcome of a fire and can
help to save lives and reduce damage to property.

In conclusion, understanding the difference between E and EI fire doors is essential when selecting fire
doors for your building. E integrity doors can provide a safe exit route for occupants, while EI fire insulation
doors provide insulation against heat transfer and smoke. When selecting fire doors, it’s important to choose
doors with the appropriate fire resistance rating for each location to ensure the highest level of protection for
occupants and property.

To speak to one of the EBD Technical Team click here