A direct-replacement blower motor built to swap out worn or failed Fasco units without custom fabrication. The 1TDV4 runs on standard 115V AC power, moves 310 cubic feet of air per minute, and carries Class B insulation with automatic overload protection -- making it a reliable fit for HVAC air handlers, furnace blower assemblies, and similar forced-air applications found in residential, light commercial, and RV settings.
The Dayton 1TDV4 (also sold under NBK Parts number 20441) is engineered as a drop-in replacement for Fasco models 7090-2379 and 7064-1678. The flange dimensions, shaft diameter, inlet size, and outlet dimensions are matched to those Fasco housings, so you can swap the motor without modifying the blower wheel, housing, or mounting bracket.
If your existing blower motor is making bearing noise, running hot, or failing to start, this Dayton unit restores full airflow capacity. At 310 CFM and a dual-speed 1400/1640 RPM rating, performance is comparable to original-equipment output.
Runs at 1400 or 1640 RPM depending on wiring configuration -- supporting two-speed HVAC setups without additional hardware.
Precision ball bearings provide longer service life and quieter operation compared to sleeve-bearing alternatives.
Built-in thermal overload protector cuts power if the motor overheats, protecting the unit from burnout during restricted-airflow conditions.
Class B rated insulation handles continuous duty at elevated temperatures -- rated up to 104 deg F (40 deg C) maximum inlet air temperature.
The motor shaft rotates clockwise (when viewed from the shaft end). Confirm rotation direction on your existing unit before ordering -- installing a wrong-rotation motor on a centrifugal blower wheel will drastically reduce airflow. The 8 mm shaft diameter is a direct match for Fasco blower wheel hubs used on the 7090-2379 and 7064-1678 series.
The 1TDV4 is rated for both 50 Hz and 60 Hz power, making it usable in North American 60 Hz HVAC systems as well as 50 Hz applications. Amperage draw is low -- 0.87A at the lower speed and 0.86A at the higher speed -- so existing wiring and fusing typically require no changes.