If your furnace is short-cycling or throwing a pressure switch error code

25-inch internal diameter (ID)

which triggers safety lockouts

this part ensures the inducer motor is generating the required static pressure before allowing the ignition sequence to proceed

What causes the SWT3211 to trip frequently

Nidec-US Motors N157 Inducer Motor 321702-401 If your furnace is short-cyclingWhen you're troubleshooting a failed furnace exhaust system, the Nidec US Motors N157 Inducer Motor is a rugged, industry standard choice for draft inducer applications. This 1 30HP furnace inducer motor operates at 3000 RPM on a 120Vac (115V nominal) power supply, pulling a consistent 1. 6 Amps. Designed as a direct OEM replacement motor, it features a shaded pole motor design and is thermally protected with an automatic reset to prevent burnout