A.O.SMITH 407470 Blower Motor F48D31B22 A.o. 1/2HP 115V 1100RPM 4SPD 1PH 10.9A MP507

( Brand: A.o.smith ), ( Manufacturer Part Number: 407470 ), ( Model: F48D31B22 ), ( Type: Blower Motor ), ( Power Frequency: 60 Hz ), ( Power Source: Corded Electric ), ( Voltage: 115 V ), ( Power Phase: 1 Phase )

Review A.O.SMITH .o.smith 407470.o. Blower Motor 1/2hp 115v 1100rpm 4spd 1ph

The **A.O. Smith 407470 F48D31B22 Blower Motor** is a high-performance, single-phase electric motor designed for demanding HVAC and water heating applications, delivering reliable and efficient airflow with precision and durability. Engineered to meet the rigorous demands of modern heating and ventilation systems, this **1/2 horsepower (0.5 HP) motor** operates at a nominal voltage of **115 volts**, ensuring compatibility with standard household electrical setups while maintaining optimal performance. With a consistent rotational speed of **1100 revolutions per minute (RPM)**, it provides a balanced blend of airflow capacity and energy efficiency, making it ideal for residential and light commercial use. The motor features a **four-speed control system**, allowing for seamless adjustments to airflow rates perfect for optimizing comfort, energy savings, or system integration in furnaces, water heaters, or ductless mini-split systems.

Built to last, this motor incorporates **A.O. Smith s proprietary MP507 series technology**, which enhances reliability, reduces wear, and extends operational lifespan through advanced bearing and winding designs. The **10.9-ampere (10.9A) current draw** ensures it operates within standard electrical circuits without overloading, while its compact yet robust construction minimizes installation complexity. The motor s sealed design protects internal components from dust, moisture, and debris, making it well-suited for environments where durability is critical. Whether integrated into a forced-air furnace, a high-efficiency water heater, or a ductless heating/cooling system, this blower motor delivers consistent performance with minimal maintenance requirements. Its quiet operation and smooth airflow further contribute to a comfortable indoor environment, reinforcing A.O. Smith s reputation for crafting dependable, high-quality HVAC components that meet the evolving needs of modern heating and cooling systems.

### **Pros and Cons of buying a AO Smith 407470 (MP507) 1/2 HP 115V Blower Motor**

1. **High Efficiency and Performance** The 1/2 HP motor is designed for residential HVAC systems, providing reliable airflow for heating and cooling applications. The 1100 RPM speed ensures adequate ventilation without excessive noise.

2. **Variable Speed Control (4-Speed)** The four-speed settings allow for precise control over airflow, improving energy efficiency by adjusting motor speed based on demand. This helps reduce wear and tear while optimizing comfort.

3. **Single-Phase Operation (115V)** The 115V single-phase motor is compatible with standard household electrical systems, making installation easier and avoiding the need for specialized wiring.

4. **Durable Construction** AO Smith is a reputable brand known for quality HVAC components. This motor is built to last, with robust materials that resist corrosion and mechanical stress.

5. **Quiet Operation** At 10.9 amps, the motor is designed to run efficiently with minimal noise, which is beneficial for residential use where comfort and quietness are priorities.

6. **Compatibility with Common HVAC Systems** The MP507 model is designed to fit standard furnace and air handler setups, making it a straightforward replacement for failing or outdated blower motors.

7. **Energy Savings Potential** The variable speed feature can reduce energy consumption compared to fixed-speed motors, leading to lower electricity bills over time.

8. **Easy Installation** Many users report that this motor is relatively straightforward to install, especially if replacing an existing blower motor of similar specifications.

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1. **Limited Power for Large Systems** At only 1/2 HP, this motor may struggle with very large homes or high-capacity HVAC systems that require stronger airflow. It is best suited for mid-sized residential applications.

2. **Potential Compatibility Issues** While designed for common systems, there may be slight mismatches in mounting or electrical connections depending on the specific furnace or air handler model. Always verify compatibility with your system s manual.

3. **Cost Compared to Generic Brands** AO Smith is a premium brand, and this motor may be more expensive than generic or aftermarket alternatives. However, the reliability often justifies the price.

4. **Noise Concerns in Some Cases** While generally quiet, some users report slight humming or vibration, particularly if the motor is not properly aligned or if the system has other mechanical issues.

5. **Single-Speed Operation Limitations** While it has four speeds, some advanced systems may require more precise control, which this motor does not offer.

6. **Potential for Overheating in Poorly Ventilated Enclosures** If installed in a poorly ventilated furnace or air handler, the motor could overheat, reducing lifespan. Ensure proper airflow around the motor.

7. **Limited Warranty Compared to Some Competitors** AO Smith s warranty may not be as extensive as some other high-end brands, though it is still reliable for most residential applications.

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### **Conclusion**

The AO Smith 407470 (MP507) 1/2 HP blower motor is a solid, efficient choice for mid-sized residential HVAC systems. Its variable speed control, durability, and compatibility with standard electrical systems make it a practical upgrade for many homeowners. However, it may not be ideal for very large systems or those requiring extreme performance. If your system is compatible and you prioritize reliability and energy efficiency, this motor is a strong recommendation.

### **Recommendation**

- You have a mid-sized residential HVAC system.

- You want a durable, efficient blower motor with variable speed control.

- You prefer a reputable brand with good long-term reliability.

- Your system s electrical setup matches the 115V single-phase requirement.

- Your system requires a higher horsepower motor (e.g., 3/4 HP or 1 HP).

- You are on a tight budget and generic brands offer comparable performance.

- Your furnace or air handler has unusual mounting or electrical requirements.

For most standard applications, the AO Smith MP507 is an excellent, low-maintenance choice that balances performance and cost effectively. Always double-check compatibility with your specific system before purchasing.

Details:

Purchasing used parts you agree with the statement that sometimes hidden defects or malfunctions may occur during installation continuous use. Old system was replaced with newer one more energy efficient and in good working condition. Please see more details from the images attached. Most of the parts require specific knowledge and skills to be installed properly.

Smith F48D31B22 Blower Motor 1/2HP 115V 1100RPM 4SPD 1PH 10.9A 407470 used part. There is no warranty on used parts. This part was removed by HVAC installer from a working unit. Motor has been tested, works well and it is in good cosmetic condition.

part #: 407470 prices

• $110.00-$120.00

specifications fablowehva:

• brand: A.o.smith
• mpn: 407470
• model: F48d31b22
• type: Blower Motor
• power frequency: 60 Hz
• power source: Corded Electric
• voltage: 115 V
• power phase: 1 Phase

payments fablowehva:

• other
• credit card: Visa
• wallet: Apple-pay

offer fablowehva:

• started: February 17, 2026
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• sold: 0

returns fablowehva:

• method: Money back
• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

general fablowehva:

• condition: Used
• HVAC Refrigeration > HVAC Refrigeration: Parts Accessories > HVAC Refrigeration: Fans Blowers

shipping fablowehva:

• class: Standard
• type: Fixed
• transit: 3-8 Days
• cost: $0.00
• carrier: USPS
• service: USPS Ground Advantage

seller fablowehva:

• city: Glendale, California
• rating: 100.0%
• # reviews: 27390

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