A direct-replacement blower motor engineered for HVAC, furnace, and ventilation applications where the original Dayton unit has worn out. The 1TDT2 delivers 549 CFM of airflow at 1330 RPM on a standard 115V/60Hz circuit, backed by ball bearing construction for long service life and automatic overload protection for added safety. Also sold and shipped under NBK part number 20499.
The 1TDT2 is purpose-built to replace several discontinued or superseded Dayton blower motors without requiring wiring modifications or new mounting brackets. If your existing unit is failing -- noisy bearings, reduced airflow, tripping overload protection -- this is the correct service replacement to restore full system performance.
Clockwise shaft rotation, a 12 mm shaft diameter, and a standardized flange pattern mean installation is straightforward for anyone comfortable with basic HVAC service work. The motor ships fully assembled with the squirrel cage blower wheel attached.
Moves high volumes of air at 1330 RPM -- suitable for residential and light-commercial HVAC, forced-air furnaces, and ventilation cabinets.
Dual ball bearings provide longer service life and quieter operation compared to sleeve-bearing alternatives, especially in continuous-duty applications.
Built-in thermal overload protector shuts the motor down if it overheats, protecting the winding and the connected equipment.
Class B winding insulation is rated for continuous duty and handles typical HVAC operating temperatures with a standard thermal margin above ambient.
The 1TDT2 is the current-production replacement for the following Dayton blower motor part numbers:
If your unit carries any of these numbers on its label, the 1TDT2 (NBK 20499) is the correct service replacement. Verify shaft rotation direction (clockwise) and inlet/outlet dimensions against your existing housing before ordering if the original label is missing.
Shaft rotation is clockwise when viewed from the shaft end. This matches the original Dayton units listed above. Incorrect rotation direction in a squirrel cage application will significantly reduce airflow -- confirm before installation.
The 1TDT2 runs on standard North American 115V/60Hz single-phase power, drawing 2.2 amps at full load. Total power draw is approximately 253 watts, well within the capacity of a standard 15A HVAC circuit. No special wiring or capacitor is required beyond what the original motor used.
This motor is rated for inlet air up to 104 deg F. Applications that route heated air (return air from a heat exchanger, for example) must stay within this limit. Exceeding it will shorten winding life and may trip the thermal overload prematurely.
Before ordering, compare these dimensions to your existing motor and housing. The flange mounts at 6-5/8 in wide by 5-5/8 in tall. The squirrel cage wheel is 6-1/4 in diameter by 3-3/4 in wide. The inlet opening is 5-1/4 in diameter and the outlet is 5-1/4 in wide by 4-1/4 in tall. Overall unit envelope is 11-1/8 in tall x 9-1/8 in wide x 10-3/8 in deep. Shaft diameter is 12 mm.