Fire resistant timber doorsets with steel structure, which is a double-layer wooden board with galvanized iron or double-layered wood with a single-sided gypsum board for outer iron. Double-layer wood or double-layer can also be used. Asbestos outsourcing iron. The new standard for fire doors stipulates that steel-wood fire doors are made of steel and flame-retardant wood materials or flame-retardant wood products. The door frame, door leaf frame, door leaf panel and door fan filling materials are non-toxic and fire-resistant materials for the human body, and It is equipped with a fireproof hardware fitting with a certain fire resistance. The fire end of such fire doors is above 1.2H.