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The Lennox 27H93 (27H9301) is a genuine OEM red-coded orifice used in compatible Lennox HVAC systems to deliver precise refrigerant flow control and ensure efficient operation. The red color coding allows for quick identification during installation or service, helping technicians select the correct orifice size. A damaged or clogged orifice can lead to poor system performance, insufficient capacity, and higher energy bills, making timely replacement with this authentic Lennox part essential.