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40 Maintenance <br /> 4. Remove the rear liner. Lift it up and remove it from the firebox. <br /> 5. With the liners removed, clean all flyash and debris from the firebox. Clean the liners before <br /> replacing. <br /> Cleaning the Exhaust Duct <br /> The exhaust duct directs air to the exhaust blower. Follow the directions below to clean. <br /> 1. Open the door. <br /> 2. Remove the ashpan. <br /> 3. Remove the two exhaust duct covers as shown below. <br /> 4. Use a brush or vacuum cleaner to clean out the exhaust ducts and the area inside the firebox. <br /> ©Travis Industries 4070806 100-01191000 <br />