Using the FAN1252 ensures the motor stays within its rated amperage while moving the correct volume of air for the condenser coil

and they are interchangeable in all documented Lennox technical manuals

1" water column (wc)

the R-B terminals open high (for heating) and the R-Y terminals open low (for cooling or circulator control)

ensuring a consistent arc for rapid fuel ignition

Nordyne 493214R Heat Exchanger R-410A Using the FAN1252 ensures theThe Nordyne 493214R Heat Exchanger is an OEM primary heat exchanger engineered specifically for Nordyne gas furnaces and M1MB series indoor units. Designed to meet exact factory tolerances, this aluminized steel heat exchanger ensures efficient thermal transfer while maintaining structural integrity under high cycle stress. As a direct HVAC replacement part, it addresses common failure points such as stress fractures or combustion byproduct buildup