In today's stringent fire safety regulations, the term "EI standard" has become a prerequisite for the acceptance testing of building electromechanical systems. In particular, for ventilation, smoke extraction in corridors, and stairwell pressurization systems, the correct application of EI classifications directly determines the safety of the building in the event of a fire.
So what is the nature of EI standard What are EI 30, EI 45, and EI 60, and what do these parameters mean technically? This article will provide a detailed explanation from the practical perspective of an M&E engineer.
1. What is the nature of the EI standard?
EI is an acronym for two English terms representing two criteria for measuring the fire resistance of building materials or components:
- E (Integrity): It is the limit at which a material retains its structural integrity, without cracking, breaking, or developing gaps that would allow flames and toxic fumes to penetrate.
- I (Insulation – Thermal insulation properties): This is the limit at which a material can prevent the temperature of its back surface (the side not in direct contact with the flame) from rising beyond a specified threshold (usually no more than 140°C above the initial temperature).
When applied to ventilation systems, EI standard This means that the air duct must be free from deformation, punctures, or tears (Criterion E), and must not transfer high temperatures to the outer casing (Criterion I) to avoid igniting nearby technical shafts or electrical cable systems.
2. Meaning of the Symbols EI 30, EI 45, EI 60, EI 120
The number following the letters EI indicates the minimum number of minutes the duct system must maintain both integrity and insulation when completely isolated by a fire.
What is EI 30?
Ductwork must withstand fire testing for a minimum duration. 30 minutes Continuous operation without structural collapse and without heat transfer through the duct walls. Typically applied to duct systems running inside small fire compartments or areas with low fire risk.
What is EI 45?
The system is fire-resistant and heat-insulating within 45 minutes. This is a common standard for corridor exhaust systems or ventilation shafts running through standard office floors.
What is EI 60?
The pipeline must be able to withstand the thermal load. 60 minutes. EI 60 is typically mandated for pressurized stairwell ventilation systems and basement smoke extraction systems – which directly protect human escape routes in case of an emergency.
What is EI 120?
Fire resistance up to 120 minutes (2 hours). This rate is typically applied to ductwork running vertically through floors, located within the main technical shafts of high-rise buildings, or passing through particularly hazardous areas such as substations and generator rooms.
Common EI Classification Tables in HVAC Systems
| Standard Level | Fire Resistance Time | Typical Application Locations |
| EI 30 | 30 Minutes | Innermost branch duct of the compartment |
| EI 45 | 45 Minutes | Corridor smoke exhaust system |
| EI 60 | 60 Minutes | Emergency stairwell pressurization shaft |
| EI 120 | 120 Minutes | Vertical technical shaft running through the floors |
3. Current Methods for Manufacturing EI Standard Air Ducts
For a typical galvanized steel pipe to achieve these levels EI 30, EI 45, EI 60, Therefore, manufacturers are required to wrap additional layers of specialized fire-resistant and heat-insulating materials onto the outer wall of the pipe. Common solutions currently include:
- Fire-resistant gypsum board cladding: Use specialized gypsum boards combined with fiberglass wool to create a thermal insulation layer.
- Fire-resistant mortar spraying: Use a lightweight, heat-resistant mortar mixture sprayed directly onto the sheet metal surface. This method is cost-effective but requires a rough surface finish.
- Shaped fire-resistant insulation panels (Fire-resistant foam underlay): This is a modern solution that is quick to install, aesthetically pleasing, and easily obtains certifications from the Fire Prevention and Control Department.
Conclusion
Understanding the nature of EI standard And the EI 30, EI 45, and EI 60 classifications help investors be more proactive in the design approval and material selection process from the outset, avoiding situations where construction is suspended or the acceptance of the project is delayed due to incorrect fire safety regulations.
If your project requires consultation on fire-resistant ductwork solutions that meet EI standards, or needs a supplier of materials with complete certification documents, contact Sao Viet immediately for the most detailed technical support!
>>> See more: Get free technical advice and a quote!
If you are looking for a reliable ducting supplier that guarantees safety, durability, and efficiency for your project in Hai Phong and surrounding provinces, please contact us immediately:
Address: 267 Le Thanh Tong, May Chai, Hai Phong
Mrs. Hang: 0815.999.826
Mrs Giang: 0934.559.168
E-mail: vietonggio@gmail.com
