| 摘要 |
<p>This invention relates to a fire retardant door set 1 including a door 2 located in an opening defined by a jamb 3. The door 2 includes a frame 4 formed from framing elements including a top rail 5, a bottom rail 6, a lock style 7 and an in 5 style 8. The top rail 5, bottom rail 6, lock style 7 and in-style 8 being a manufactured composition combining cellulose material, intumescent material and a binder so that when the frame is heated each element expands at the edges of the door to engage a jamb. V:/sharon'brdcComm LetteAbstrect 200790372e - BjuS doc</p> |
