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The Lennox 96M06, also referenced as OEM part number 100672-01, is a heavy-duty 15-ton expansion valve engineered for use in large Lennox commercial HVAC systems. This valve carefully meters refrigerant flow to maintain precise superheat levels, maximizing system efficiency and protecting the compressor. Signs of a failing expansion valve include reduced cooling capacity, erratic suction pressure, or frost accumulation on refrigerant lines — replace with this genuine Lennox OEM part for a guaranteed fit.