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The Door insulation is a thermal barrier used in boiler doors to reduce heat loss and improve energy efficiency. It also helps protect the door and surrounding components from excessive heat. Over time, insulation can become compressed or damaged, compromising its effectiveness. Replacing this part during boiler maintenance can lower energy costs and improve comfort. The insulation material is typically fiber-based or ceramic and must be cut to fit the door dimensions. When selecting burner spare parts or heating equipment components, ensure the insulation thickness and density are suitable for your boiler model.