A direct replacement for the Dayton 4C565 blower motor, the 1TDT6 delivers reliable two-speed airflow in HVAC, heating, and ventilation equipment. Pre-matched dimensions and shaft size mean a straightforward swap with no modification required. Also cross-referenced as NBK Parts 20500.
When your original blower motor fails, the 1TDT6 restores full two-speed operation without sourcing a custom or OEM-priced unit. At high speed it moves 428 CFM at 1500 RPM; drop it to low speed and output steps down to 293 CFM at 1085 RPM -- ideal for applications that need quiet circulation or reduced airflow on demand.
Ball bearings support both speeds efficiently, and automatic thermal overload protection shuts the motor down before heat damage can occur. Class B insulation keeps it running safely in warm equipment cabinets. Counter-clockwise (CCW) shaft rotation matches the original 4C565 wheel orientation so the existing blower wheel and housing bolt straight on.
High: 428 CFM at 1500 RPM. Low: 293 CFM at 1085 RPM. One motor covers both operating modes.
Precision ball bearings provide longer service life and quieter operation versus sleeve-bearing alternatives.
Built-in thermal overload cuts power if the motor overheats, protecting the motor and connected equipment.
Replaces Dayton 4C565. Matched shaft diameter, rotation, and flange dimensions eliminate guesswork.
This motor is a direct replacement for Dayton model 4C565 and is also sold under the NBK Parts number 20500. Confirm your original motor's rotation (CCW) and voltage (115V) before ordering.
The 1TDT6 rotates counter-clockwise when viewed from the inlet side. If your existing installation uses a CW-rotation motor, this unit will not be a direct swap. Check the nameplate on your current motor before purchasing.
Do not install this motor in supply-air applications where intake air temperature can exceed 104 deg F (40 deg C). It is rated for return-air and circulation duty at or below that threshold.