Reznor 123665 Burner 321142-301 is a high-capacity thermal expansion

is a high-capacity thermal expansion valve (TXV) designed for precise refrigerant metering in large-scale commercial AC and refrigeration systems

you know that maintaining precise combustion airflow is critical for the Ultra 155 gas boiler to operate at peak efficiency and avoid lockout codes

For HVAC technicians performing maintenance or emergency repairs

this 3-blade propeller is designed for CW rotation (clockwise) to pull or push air effectively through the coil

Reznor 123665 Burner 321142-301 is a high-capacity thermal expansionThe Reznor 123665 Burner is a precision engineered replacement component designed for compatibility with specific Reznor gas fired unit heaters and duct furnaces. As a critical part of the combustion assembly, this natural gas burner ensures optimal fuel to air ratios and consistent flame stability across high output heating cycles. Built to OEM specifications, the 123665 provides a direct fit solution for maintaining thermal efficiency in commercial