The US Motors 5470 (also cataloged as NBK part 20590) is a permanent split capacitor (PSC) direct drive fan and blower motor built for continuous-duty HVAC service. With four speed taps, reversible rotation, and a rugged ring/stud mounting design, this motor is a go-to replacement for air handlers, furnace blowers, and fan coil units in both commercial and residential installations.
Permanent split capacitor motors like the 5470 are the industry standard for direct drive blower applications because they deliver smooth starts, quiet operation, and reliable long-term efficiency. The 5470 runs on standard 115V/60Hz single-phase power and draws 9.8 amps at full load -- well within the capacity of a dedicated 15A circuit.
Four speed taps give HVAC technicians the flexibility to match airflow to duct static pressure requirements without additional controls. Rotation is field-reversible, making it adaptable to a wide variety of blower wheel orientations without ordering a separate CW or CCW variant.
Four lead taps allow fine-tuned airflow matching to system static pressure requirements -- no external speed controller needed.
CW or CCW operation selectable in the field, accommodating a wide range of blower wheel and air handler orientations.
Precision ball bearings on both ends support the shaft in any mounting orientation and provide long service life under continuous-duty loads.
Automatic thermal overload protection shuts the motor down if it overheats and automatically resets once it cools -- protecting the winding investment.
The 5470 uses a resilient ring/stud mount -- the most common configuration for residential and light-commercial direct drive air handlers. The motor body sits inside a pair of resilient rubber rings that reduce vibration transmission into the cabinet, and studs on each ring plate secure the assembly to the blower housing rails.
The motor ships with a 36-inch lead set, giving installers enough slack to route wiring cleanly through the blower cabinet without splicing. Each speed tap is color-coded per industry convention. The PSC design requires a run capacitor -- capacitor is not included and must be matched to the motor's microfarad rating at installation.
Class B insulation (rated to 130 deg C rise) provides a meaningful margin above the typical operating temperatures seen in residential HVAC applications. The motor is rated for continuous air-over (CAO) duty, meaning it is designed to run indefinitely while air flows over the motor body for cooling -- the normal condition inside a blower housing.