| 摘要 |
PROBLEM TO BE SOLVED: To block the gap between a door and a door frame with airtight rubber without largely protruding the door and the door frame from an existing frame. SOLUTION: The door 2 and the door frame 3 are fitted to the existing frame 1 for modification, the door frame 3 has a shape capable of being fitted to the outside of the existing frame 1, and a door stop face 6 is provided at the position blocking the opening section of the insertion groove 5 of the existing frame 1. The door 2 is made thin at the position facing the door stop face 6, a step section 8 is provided along the outer peripheral edge of the door 2, and the airtight rubber 4 is fixed to the step section 8. When the door 2 is closed, the airtight rubber 4 is elastically pressed to the door stop face 6 of the door frame 3 to block the gap between the door 2 and a frame material.
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