... 3)Easy to install,fireproof 4)Keep warm steel structure house features:1) Materials: Q235 & Q3452) Design according to customer's ... 35 years8) Nice appearance,easy to maintenance.9) Price different from USD 40 to USD 100 due to different size/design ... , supermarket, hospital, cold storage, activities room, buildings plus layer, prefab house and others requiring to protect fire and to keep warm. .