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The McDonnell & Miller 157S-R (Part Number 176220) is a heavy-duty
which reduces turbulence and provides a more linear flow characteristic than standard parallel blades
High-Torque Performance: 1 HP output at 1075 RPM provides robust airflow for large-tonnage residential and light commercial equipment
though some techs prefer a light coating of Gasket-Seal depending on the flange condition
By securing the mounting points of the exchanger
Nordyne 620868 Humidistat 322838-753 The McDonnell & Miller 157S-RThe Nordyne 620868 Humidistat is a critical component for maintaining precise indoor air quality in residential forced air systems. As the direct replacement for 620868R, this mechanical humidistat utilizes a sensing element to monitor relative humidity levels and cycle the humidifier accordingly. This specific HVAC whole house humidistat is designed for 24V control circuits and features a robust dial interface for manual adjustments. It is engineered