Understanding Fire Door Classes: What You Need to Know

When it comes to protecting lives and property, not all fire doors are the same. Fire doors are tested and certified according to different performance levels—known as fire door classes. Each class defines how long a door can withstand fire, maintain its structure, and prevent flames and smoke from spreading.

At Stronghold Fire & Security, we supply certified fire-rated doors that meet international standards. Below, we break down what each class means, based on stability, integrity, insulation, and impact resistance.

🔥 Key Fire Door Classifications 🔥

Class A

• Stability: 1 Hour

• Integrity: 30 Minutes

• Insulation: 30 Minutes

• Impact Test: Not Required

  ➡️ Entry-level protection, suitable for areas with lower fire risks.

  
  

Class B

• Stability: 2 Hours

• Integrity: 1 Hour

• Insulation: 1 Hour

• Impact Test: Not Required

  ➡️ Enhanced resistance, recommended for commercial and industrial spaces.

  
  

Class C

• Stability: 2 Hours

• Integrity: 2 Hours

• Insulation: Not Required

• Impact Test: Required

  ➡️ Strong structural integrity with impact resistance—ideal for high-traffic and high-risk zones.

  
  

Class D

• Stability: 2 Hours

• Integrity: 2 Hours

• Insulation: 2 Hours

• Impact Test: Required

  ➡️ One of the highest ratings—suitable for critical areas like substations, control rooms, and hazardous storage facilities.

  
  

Class E

• Stability: 30 Minutes

• Integrity: 30 Minutes

• Insulation: 30 Minutes

• Impact Test: Not Required

  ➡️ Provides short-term protection—commonly used in residential or small commercial applications.

  
  

Class F

• Stability: 30 Minutes

• Integrity: 30 Minutes

• Insulation: Not Required

• Impact Test: Not Required

  ➡️ Basic fire protection where evacuation times are shorter.

  
  

✅ Why This Matters

Choosing the right fire door isn’t just about compliance—it’s about safety and peace of mind. By understanding these classes, building owners and contractors can ensure they meet both legal requirements and practical safety needs.

At Stronghold Fire & Security, we manufacture and supply custom fire-rated doors that meet these certifications. Whether you need Class A for residential use or Class D for heavy-duty industrial sites, we’ve got you covered.

📞 Contact us today for a consultation—our team will help you choose the right fire door for your project.