The Dayton 1TDT9 is a direct replacement blower motor rated at 794 CFM and 1030 RPM. It accepts dual voltage input (115V or 230V) and is built with ball bearings and automatic overload protection for reliable long-term service in HVAC, ventilation, and air-handling applications. Replaces the discontinued Dayton 4C668 and is also cataloged as NBK Parts 20502.
When your existing blower motor fails, finding an exact-spec replacement matters. The 1TDT9 matches the 4C668's airflow rating, shaft diameter, rotation direction, and overall footprint, keeping downtime short and installation straightforward. The dual 115/230V rating gives you flexibility across single-phase applications without rewiring the circuit from scratch -- simply connect to the appropriate voltage tap.
At 794 CFM, this unit moves a meaningful volume of air for medium-duty ventilation and HVAC blower assemblies. The 1030 RPM speed keeps noise levels manageable while delivering consistent airflow across the 8-1/4 in squirrel-cage wheel.
Runs on 115V (2.30A) or 230V (1.30A) single-phase, 60 Hz power. Wire to whichever voltage your system supplies.
Precision ball bearings on both ends for longer service life and quieter operation compared to sleeve-bearing designs.
Built-in thermal overload automatically cuts power if the motor overheats, protecting the winding and downstream equipment.
Rotation is clockwise when viewed from the shaft end -- confirm your existing unit's rotation before ordering to ensure drop-in compatibility.