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Laars Heating Systems 20401201 Burner 320734 701 Replacing a faulty control board Replacing a faulty control board with a genuine Lennox 39M84 restores proper airflow and protects the heat exchanger from overheating by ensuring the blower starts and stops in synchronization with the heating or cooling demand The rugged one piece molded beige housing is engineered for durability on the job site
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