Lennox 31K74 Blower Shaft R 134A ensuring more precise temperature regulation ensuring more precise temperature regulation without the complexity of scheduling this heavy duty assembly provides the exact tolerance and commercial HVAC part durability required to withstand high output cycles in rooftops and split systems we recommend using the exact 18" blower shaft specified for your model to ensure proper balance and alignment with the motor mount and support brackets OEM Compatibility: Specifically designed as a Lennox 31K74 replacement to maintain original equipment performance and airflow efficiency
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Lennox 31K74 Blower Shaft R-134A ensuring more precise temperature regulation