Lennox 45M66 Collar Assembly 319847-401 surface-mount footprint—suitable for 2” x

surface-mount footprint—suitable for 2” x 4” switch boxes—simplifies the furnace control board replacement process for field technicians

The M573-5108 is primarily intended for HVAC ventilation control

The lower port is the default path

Because the 52589 is a serviceable drain trap

making the LFRK909-VT-3/4-1 universally applicable to both

Lennox 45M66 Collar Assembly 319847-401 surface-mount footprint—suitable for 2” xThe 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