In case of fire, the fire door will be baked in a high temperature environment for more than 30 minutes.

https://ztfiredoor.com/20500.html

fire rated door interior door,fire rated doors with panic bar fire proof door,motise door lock fire door,fire door handle for panic exit device fire rated door handles,mortise door lock fire door escape aisle,emergency exit door emergency fire door emergency steel door,fire rated door interior door,security mortise fire door lock body for push,motise door lock fire door,mortise door lock fire door escape aisle,double swing steel fire rated doors fire-proof,mortise door lock fire door escape aisle,ul certificated fire door,motise door lock fire door,door handle for fire door,fire rated door interior door