| 摘要 |
PURPOSE: A vacuum entrance door is provided to heat a room in the winter and cool the room in the summer by reducing the emission of poisonous gases in fire and reducing heat loss or cold loss. CONSTITUTION: A vacuum entrance door comprises a Styrofoam part(A) and vacuum parts(1,2,3,4,5,6,7). The vacuum part is prevented from being fired in order not to generate poisonous gases. The Styrofoam part emits the little amount of the poisonous gases. |
