The Dayton 1TDT7 is a direct replacement 2-speed blower motor engineered for HVAC and ventilation applications that demand reliable, dual-speed airflow control. Running at 542 CFM on high and 409 CFM on low, this 115V motor delivers consistent performance with ball bearing construction and built-in automatic overload protection. It replaces the discontinued Dayton 4C565 and is also catalogued under NBK part number 20501.
When a blower motor fails in a furnace air handler, ventilation unit, or commercial HVAC system, a like-for-like replacement is critical. The Dayton 1TDT7 matches the electrical and dimensional footprint of the original 4C565, letting you restore full operation without custom fabrication or wiring changes.
Two selectable speeds -- 1380 RPM on high and 1045 RPM on low -- allow the connected system to balance between maximum airflow and quieter, energy-reduced operation. At just 6 lbs and 2.0 amps draw, this motor is compact and efficient for its output class.
High: 542 CFM at 1380 RPM. Low: 409 CFM at 1045 RPM. Two discrete operating modes for flexible system control.
Precision ball bearings support longer service life and consistent shaft alignment compared to sleeve-bearing alternatives.
Built-in thermal overload protection shuts the motor down if operating temperatures exceed safe limits, protecting both the motor and the connected system.
Dimensionally matched to the Dayton 4C565. Clockwise rotation, 12 mm shaft diameter, and matching flange ensure drop-in compatibility.
This motor is a direct replacement for the Dayton model 4C565. It is also sold and cross-referenced under NBK part number 20501. Before ordering, confirm your existing motor's rotation direction (this unit is clockwise when viewed from the shaft end), shaft diameter (12 mm), and flange dimensions (6-5/8 in W x 5-5/8 in H) match your application.
Class B insulation is rated for continuous duty in standard HVAC environments. The 104 deg F maximum inlet temperature rating is suited to typical forced-air system intake conditions. Ball bearings on both ends of the shaft maintain alignment under sustained load and reduce long-term maintenance requirements compared to oil-impregnated sleeve bearings.
The 1TDT7 is suited for use in residential and light commercial forced-air systems, air handlers, ventilation units, and similar applications where the original 4C565 was specified. Verify the blower wheel bore accepts a 12 mm shaft and that your housing matches the motor's overall envelope dimensions before installation.