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Small volume, reasonable structure, and the traditional small square furnace has a greater difference. Because of the use of firebrick and asbestos board, the traditional small square furnace is easy to be damaged, so it is often necessary to rebuild the furnace, which brings unnecessary economic losses and troubles to the user. The current hydraulic small square furnace does not have the trouble of consumable damage, durable, reasonable design, power consumption, fast speed, low cost, bring significant economic benefits to users, and is welcomed by the market.