Key Points of Fire Resistant External Doors

Fire Resistant External Doors play a crucial role during a fire. They not only meet the requirements of fire resistance, integrity, and insulation but also effectively prevent the spread of fire and smoke. As essential facilities in fire compartments, evacuation stairwells, vertical shafts, and other locations, fire resistant external doors ensure the safe evacuation of people during a fire. Below, we will provide a detailed introduction to the classification and composition of fire resistant external doors to give you a deeper understanding of fire resistant external doors.

Classification of Fire Resistant External Doors

By Material

Fire resistant external doors can be classified by material into the following categories:

• Wooden fire resistant external doors: Made of flame-retardant wood, combining fire resistance and aesthetics.

  
  

• Steel-wood fire resistant external doors: Combining the advantages of steel and wood, they are both sturdy and decorative.

  
  

• Steel fire resistant external doors: Made of steel, offering strong fire resistance, and the most common type of fire resistant external doors.

• Other Materials fire resistant external doors: Such as aluminum alloy, inorganic materials, etc., selected based on specific needs.

By Grade Classification

Fire resistant external doors are classified by fire resistance performance into Class A, Class B, and Class C:

• Class A fire resistant external doors: Fire resistance limit of 1.5 hours, with excellent insulation and fire resistance performance.

  
  

• Class B fire resistant external doors: Fire resistance limit of 1 hour, suitable for most homes and commercial places.

  
  

• Class C fire resistant external doors: Fire resistance limit of 0.5 hours, suitable for places with lower requirements.

Different grades of fire resistant external doors are not easily distinguishable by appearance and can be identified through the following methods:

• Check the label information: Fire resistant external doors' frames will have information about the manufacturer, material used, and fire resistance grade.

• Measure specifications: Wooden and steel fire resistant external doors have different frame and door panel thicknesses, which can be measured to confirm the grade.

Composition of Fire Resistant External Doors

Door Frame, Door Panel, and Filling Material

Fire resistant external doors mainly consist of door frames, door panels, and filling materials:

Wooden fire resistant external doors

Made of flame-retardant wood for door panels and frames, with non-toxic and harmless fireproof and insulation materials inside.

Steel fire resistant external doors

Made by stamping and assembling galvanized iron sheets. The door frame's steel plate thickness should be greater than 1.2mm, and the door panel should be greater than 0.8mm. The filling material is often perlite fireproof board, which is non-toxic, insulating, and simple to process.

Fireproof Hinges

Fire resistant external doors should have hinges with a thickness not less than 3mm to ensure the door panel remains stably closed during a fire.

Fireproof Locks (Push Bar Locks)

Fire resistant external doors should be equipped with locks that are certified fireproof by national standards. In highly populated areas such as malls and supermarkets, fire resistant external doors should have push bar locks for rapid escape in emergencies.

Expanding Seal Strips

Expanding seal strips are installed in the grooves around the door frame and door panel. When exposed to heat, they expand to seal the door gap and prevent smoke from passing through.

Door Closers

Fire resistant external doors should be equipped with door closers or other automatic closing devices to ensure the door panel automatically closes during a fire, preventing the spread of fire and smoke.

Sequence Regulators

Double-door fire resistant external doors should be equipped with sequence regulators to ensure the two doors close in the correct order, ensuring fireproof effectiveness.

Electromagnetic Door Holders

Normally open fire resistant external doors need electromagnetic door holders to stay open under normal circumstances. During a fire, they release and the door panels automatically close under the action of the door closers.

Fireproof Glass

Fire resistant external doors should use fireproof glass that meets the fire resistance requirements for corresponding categories.

What to Pay Attention to When Purchasing Fire Resistant External Doors

When purchasing fire resistant external doors, pay attention to the following points:

Choose well-known brands

Big brands offer better quality and after-sales service.

Check fireproof certification

Look for national fire testing certification to ensure fire resistant external doors meet standards.

Pay attention to the material and structure of the door

High-quality fire resistant external doors will not be too light or thin, and the structure will be sturdy with fire-resistant materials.

Consider actual needs

Choose the appropriate material, grade, and opening method according to the installation location.

By understanding the knowledge and key points of purchasing fire resistant external doors, you can provide better safety protection for your family and yourself. In case of an emergency, fire resistant external doors can buy you precious escape time, ensuring life safety. We hope this article helps you better understand and choose fire resistant external doors to provide comprehensive protection for your home and work environment.