312" orifice is precision-sized for 15 PSI differential service

always verify the equipment model

this control is rated for both 120 VAC and 240 VAC applications

immediate replacement is necessary to prevent compressor failure

Lennox 45M66 Collar Assembly 321142-301 312" orifice is precision-sized forThe Lennox 45M66 Collar Assembly is an essential OEM replacement part designed specifically for high efficiency HVAC cabinet and ductwork transitions. This Right Hand Collar Assembly (part number LB 96380A) provides the structural interface required to maintain rigid connections at the unit discharge or return plenum, ensuring no static pressure loss at critical junction points. Manufactured to original Lennox HVAC equipment tolerances, the 45M66