The Dayton 1TDN4 is a direct replacement blower motor engineered to restore proper airflow in HVAC equipment, RV furnaces, space heaters, and other small forced-air applications. It delivers a reliable 49 CFM at 3080 RPM from a compact 115V/60Hz motor, making it a drop-in fix when the original Dayton 4C761 fails. Also catalogued as NBK Parts 20660.
The 1TDN4 uses precision ball bearings rather than sleeve bearings, which extends motor life in both horizontal and vertical mounting orientations and holds up better in environments with temperature swings. Class B insulation means it is rated for continuous duty at elevated winding temperatures, giving you a motor that handles real-world heat without premature failure.
At just 6 lbs and measuring approximately 4-1/2" tall x 4-1/8" wide x 4-1/2" deep, this is a genuinely compact unit. The 2-7/8" diameter squirrel-cage wheel and 2-1/2" inlet keep the airflow path efficient for the motor's power class. Automatic overload protection shuts the motor down before heat damage occurs if the wheel is obstructed or the unit is run outside its design envelope.
Moves 49 cubic feet per minute -- adequate for furnace combustion air, space heater blowers, and small duct fans in compact RV and residential equipment.
Ball bearings outperform sleeve bearings in longevity and multi-orientation mounting. Suitable for horizontal or vertical shaft installations.
Built-in thermal overload shuts the motor down if it overheats, protecting the winding and downstream equipment from damage.
Drop-in replacement for Dayton model 4C761. Same shaft diameter, wheel dimensions, flange pattern, and rotation direction. Also catalogued as NBK 20660.