Trane SWT3820 Pressure Switch 321042-401 Always verify the rotation of

Always verify the rotation of your existing blower wheel or fan blade before installation to ensure proper airflow direction

Built from heavy-duty

though the specific orifice size in your manifold determines the gas type compatibility

If your unit only records a single variable with one pen

it features a durable housing and a balanced blower wheel to minimize vibration and prevent premature bearing wear

Trane SWT3820 Pressure Switch 321042-401 Always verify the rotation ofThe Trane SWT3820 Pressure Switch is an essential safety component designed for precise monitoring of combustion blower pressures in Trane and American Standard furnace systems. This OEM furnace pressure switch operates with tight tolerances, featuring a factory set 1. 75" WC Open and 1. 94" WC Close rating. Engineered to detect proper venting and prevent operation under restricted airflow conditions, the SWT3820 ensures the induced draft motor is