The Dayton 1TDU1 is a direct replacement centrifugal blower motor rated at 990 CFM and designed to handle dual voltage operation at 115V or 230V, 50/60 Hz. It replaces the discontinued Dayton model 4C830 and is also cataloged under NBK Parts number 20530. Built with ball bearings and automatic overload protection, this unit is a dependable drop-in for HVAC, ventilation, and forced-air applications where consistent airflow and long service life matter.
When a blower motor fails in a furnace, air handler, or ventilation system, downtime is the enemy. The 1TDU1 is engineered to match the output and mounting footprint of the Dayton 4C830, so you can restore full airflow without fabricating adapters or modifying ductwork. The dual-voltage winding (115V or 230V) makes this motor compatible with a wider range of installations across North American and international electrical standards.
At 990 cubic feet per minute, this motor moves serious air. The clockwise shaft rotation, 14 mm shaft diameter, and known housing envelope mean you can confirm fitment before you order -- no guessing. The two-speed RPM range (920 at 50 Hz, 1050 at 60 Hz) ensures consistent performance whether your supply frequency is 50 or 60 Hz.
High-volume centrifugal blower output suitable for residential and light commercial forced-air systems and RV HVAC applications.
Operates at 115V or 230V, 50/60 Hz -- one motor covers multiple electrical configurations without rewiring the entire circuit.
Ball bearings deliver longer service life and quieter operation compared to sleeve bearing designs, especially in continuous-duty environments.
Built-in thermal overload protection shuts the motor down before heat damage occurs, then resets automatically once it cools.
The 1TDU1 was designed to replace the Dayton 4C830 blower motor. Housing dimensions, shaft diameter, inlet/outlet sizing, and rotation direction match the original specification so you can swap in this unit with minimal modification.
This motor turns clockwise when viewed from the shaft end. Confirm your existing blower wheel and scroll housing require clockwise rotation before ordering. Installing a motor with incorrect rotation direction will push air backward through the duct system and reduce airflow significantly.
Do not install this motor in airstreams that exceed 104 deg F (40 deg C) at the inlet. Applications involving recirculated high-temperature air, oven exhaust, or dryer bypass are outside this motor's rated envelope.