Chelik yong’in eshiklarini tayyorlash uchun ichki va tashqi materiallar, u plomba moddasi yoki tashqi po’lat bo’ladimi, tanlanadi. Po’lat yong’inga qarshi eshiklarning po’lat xususiyatlari odamlarni xavfsizroq his qilishlari va psixologik jihatdan po’latdan yasalgan yong’in eshiklariga ko’proq ishonishlari mumkin.

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