Types of Fire-Resistant Glass Doors: EI, EW & E Ratings Explained
What Fire Ratings Mean
Fire-resistant glass doors undergo rigorous testing to evaluate how they behave under real fire exposure conditions. These classifications indicate the level of protection offered in different scenarios.
E → Restricts flames & hot gases
EW → Restricts fire + limits radiant heat transmission
EI → Restricts fire + blocks heat transfer
As performance increases across these classifications, the level of protection provided also becomes more comprehensive.
Understanding E, EW & EI with Time Ratings
Fire ratings are always defined along with time performance, expressed in minutes, to indicate how long protection is maintained during fire exposure.
E30 / E60 / E120 → Resists flames & smoke spread for 30, 60, or 120 minutes
EW30 / EW60 → Resists flames while controlling radiant heat for a defined duration
EI30 / EI60 / EI120 → Ensures insulation performance by stopping heat transfer for extended protection
The numerical value represents the duration for which the system continues to perform under fire conditions.
Why These Ratings Matter
Fire ratings play a crucial role in defining how effectively occupants can evacuate safely during an emergency.
Each rating corresponds to a different level of protection, making correct specification essential for life safety planning. These ratings directly influence:
Fire containment
Heat exposure levels
Safe evacuation
Choosing the right rating = better life safety and code compliance
E-Rated Vision Panel Glass Door
Rating: Integrity (E)
What it does
- Restricts flames & hot gases
- Limits the spread of fire to adjoining spaces
Why it matters: While it effectively contains flames, it does not control heat radiation from the fire side to the protected side, which can impact nearby materials and occupants.
Limitation: Not recommended for escape routes or areas with high occupant density.
Best for: Vision panels in metal doors, internal partitions, commercial kitchen separations, and applications requiring basic fire compartmentalization.
EW-Rated Glass Door
Rating: Integrity + Radiation Control (EW)
What it does
- Restricts flames & smoke
- Reduces radiant heat transmission on the non-fire side
Why it matters: Radiant heat, if left uncontrolled, can lead to ignition of nearby materials or cause harm to occupants even in the absence of direct flame exposure. EW-rated solutions enhance safety by limiting this heat transfer.
Best for: Corridors, lobbies, circulation spaces, and refuge areas where controlled heat exposure is important.
EI-Rated Glass Door
Rating: Integrity + Insulation (EI)
What it does
- Stops flames & smoke
- Provides insulation against heat transfer
- Maintains significantly lower temperatures on the non-fire side
Why it matters: This level of protection is essential in areas where occupants may need to pass through, wait, or gather during evacuation.
- Helps protect people in close proximity by minimizing radiant heat exposure
- Maintains surface temperature rise below 140°C, supporting safer movement and waiting conditions
- Reduces the risk of burn injuries by preventing surfaces from reaching critical temperatures
Best for: Escape routes, staircases, and high-occupancy zones where maximum protection is required.
Quick Comparison: E vs EW vs EI
Rating | Flames and Hot Gases | Smoke | Heat Radiation Protection |
E | ✔ | ✔ | ✖ |
EW | ✔ | ✔ | Partial Radiation Protection |
EI | ️✔ | ✔ | Full |
Which One Should You Choose?
Selection Guide
- Choose E for basic fire separation requirements
- Choose EW where reducing radiant heat is important
- Choose EI for maximum occupant protection in escape and evacuation routes
Vetrotech Saint-Gobain delivers certified fire-resistant glazing solutions designed to enhance safety, support compliance, and integrate seamlessly into modern architectural designs.
