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Hi. Primitive Technology Upgrade Metal Furnace (Forge) is our next video. In this video we upgraded Metal Furnace, we built a new model, we built a powerful fan system to burn coke and achieve high temperature. We use bamboo tube to make the fan system. We built the blast furnace and two large blowers. In the next video we will test metal fabrication. We will continue to make the next video on primitive technology and wild survival skills. Subscribe to the channel to keep track of the latest videos. Thank you.