Internal fire doors use fire-resistant wood or fire-resistant wood products as door frames, door leaf skeletons, and door leaf panels. Internal fire doors prevent the spread of fire and thick smoke when the fire comes, and buy time for people to escape.

https://ztfiredoor.com/21095.html

fire rated exterior door,anti fire doors,32 x 78 fire rated door,1 hour fire rated door with vision panel,3 hour fire door,fire rated doors for home,fire rated exterior door,hollow core door fire rating,32 x 78 fire rated door,3 hour fire door,28 x 80 fire rated door,fire rated exterior door,fire resistant front door,32 x 78 fire rated door,solid fire rated door,3 hour fire door