1. According to material, fire doors can be divided into: wooden fire doors, steel fire doors, steel-wood fire doors, and fire doors made of other materials. Commonly used fire doors are wooden and steel fire doors.
2. According to fire resistance performance, fire doors can be divided into: insulated fire doors (Class A), partially insulated fire doors (Class B), and non-insulated fire doors (Class C).
3. Insulated fire doors commonly have three fire resistance ratings: Class A (1.5h), Class B (1.0h), and Class C (0.5h). Fire doors leading to evacuation staircases are generally Class B fire doors, which will not break even after 60 minutes of burning.
4. According to opening method, fire doors can also be divided into normally open fire doors and normally closed fire doors.
