The present invention relates to indoor Chinese.;The guide member having guides formed at both sides and the center is installed in the grooves formed at the upper and lower sides of the door frame, and the guide protrudes higher than the rail for guiding the middle door so that the guide does not show the rail when opening and closing the middle door. In addition, the overall aesthetics of the middle door are further improved, and the mohair is installed in the gap formed between the front and rear doors, which is characterized by windproof and soundproofing.
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