ATMA SUPPLY SM550 Universal Bathroom Exhaust Motor Replacement Kit | Nutone Broan 50 CFM

Overview

Refresh your bathroom ventilation with the ATMA SUPPLY SM550 Universal Bathroom Exhaust Motor Replacement Kit. Engineered for broad compatibility, this 120-volt, 60 Hz motor delivers 50 CFM at up to 3000 RPM and draws about 0.29 A. A key feature is reversible rotation, so you can align the motor with your existing blower wheel without major changes. This kit is designed as a practical retrofit for popular models, especially Nutone Broan units such as model 65100, while remaining compatible with many other brands often found in residential baths.

What’s in the box

• 1 x SM550 universal motor
• 1 x paddle-style fan with a 4.5" flat or paddle blade
• Shaft approximately 3/16" x 1 3/4"
• Wire length 8.5" with a 2-prong plug
• Mounting studs 1 7/8" on center
• 5/8" coil stack

Key specifications

• Voltage: 120V, Frequency: 60Hz
• Airflow: 50 CFM at rated speed
• Current draw: about 0.29A; Speed: up to 3000 RPM
• Rotation: reversible, CCW or CW
• Fits numerous fans by a straightforward replacement approach

Compatibility and installation tips

The SM550 motor is designed to replace a wide range of common bathroom exhaust units, including Nutone Broan 65100 and other brands such as Uppco, Ventorola E498-1, Bay Motors, Sears, and Dayton. Before swapping, verify your shaft size, mounting spacing, and electrical plug configuration to ensure a smooth retrofit. Power off and unplug the unit during installation, verify that the shaft aligns with the blower wheel, and secure mounting studs to avoid vibration.

If you run into fit questions or need guidance on wiring orientation, ATMA SUPPLY offers friendly support to help you determine the best match for your setup.

Why choose ATMA SUPPLY

ATMA SUPPLY parts are built to support common residential bath ventilation needs. This SM550 kit aims to simplify replacement with a compact motor and a compatible paddle fan, designed for easy retrofit in many models. While results can vary by unit, users often appreciate the straightforward swap, the clear specifications, and the potential to restore airflow without a full fan replacement. If the kit doesn’t meet your expectations, we’re here to help.