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اندازه اتصال درب نسوز فولادی به وضوح مشخص شده است: خواهر بزرگ ورقه در و چارچوب در نباید کمتر از 10 میلی متر باشد و فاصله بین لنگه در و چارچوب در نباید از 4 میلی متر تجاوز کند.

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