Ƙofar wuta ta ƙarfe an yi ta ne da ƙarfe mai galvanized, tare da shinge mai kariya na oxide da kuma abin rufe fuska na ultraviolet a waje. Ana yayyafa kayan ƙofar wuta na ƙarfe tare da Layer na “perlite board,” ko wani abu mai hana wuta, wanda zai iya ware wutar da kyau kuma ya hana wutar yadawa.

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