Best 2 Speed Attic Fan Motor Options for Efficient Cooling
When selecting a 2 speed attic fan motor, homeowners seek reliability, easy installation, and performance that fits common attic ventilation needs. This guide highlights five practical replacement motors designed for attic fans with two-speed operation, covering compatibility, power, and mounting details. Each option includes key specs to help you compare performance and installation requirements. Use this overview to identify a suitable motor and then review detailed product sections for installation notes and features.
| Product | Brand | Speed/HP | RPM | Voltage | Compatibility Notes |
|---|---|---|---|---|---|
| Marathon B402 48Y | Marathon Electric | 2 speeds, 1/3 hp | 1800/1200 | 115 VAC | 48Y frame, totally enclosed |
| F0510B2944 | Behonor | 2 speeds, 1/10 hp | 1100 | 120V 60Hz | Universal Lomanco replacements kit |
| F0510B2944 (LyteSolar kit) | LyteSolar | 2 speeds, 1/10 hp | 1100 | 120V 60Hz | Universal mounting hardware included |
| Wall Furnace Motor | ELECTRIC MOTOR WAREHOUSE | 2 speeds | 1050 | 115V | 2-speed, CCW rotation |
| Dial 2548 | Dial | 2-speed, 1/2 hp | — | 115V | Standard motor kit with copper windings |
Marathon B402 48Y Frame Attic Fan Motor
The Marathon B402 is a two-speed attic fan motor rated at 1/3 horsepower, delivering up to 1800 RPM on high and 1200 RPM on low. The 48Y frame is designed for a robust, totally enclosed motor enclosure with a resilient base and ball bearings, offering durable operation in hot attic environments. This motor is suitable where a reliable, two-speed performance is needed to balance ventilation and energy use. Installation typically requires standard mounting hardware compatible with common attic fans, and the split-phase design supports straightforward wiring.
F0510B2944 Attic Fan Motor Kit (Universal Replacement)
Behonor’s F0510B2944 provides compatibility with Lomanco 2000 and 1800 series attic ventilation motors, featuring a two-speed design at 120V, 60Hz, 3.4A with a 5/8 ft shaft and 1100 RPM at 1/10 HP. The kit includes the motor, bridges, nylon nuts, and an instruction manual, making it a convenient replacement option for existing Lomanco installations. It emphasizes straightforward installation and secure mounting, aiming to minimize downtime during attic maintenance.
F0510B2944 Attic Motor Kit (LyteSolar)
LyteSolar’s F0510B2944 motor kit offers a complete replacement package with two speeds and a 1/10 HP rating. The kit includes mounting wings, nylon locking nuts, and a comprehensive instruction manual. It is designed for compatibility with Lomanco 2000 and 1800 series attic ventilators and features a 5″ motor diameter, 1/2″ shaft, and clockwise rotation when facing the shaft. Installation is marketed as simple, with a universal mounting hardware kit that allows transfer of conduit and easy wiring.
Wall Furnace Motor – 2 Speed, CCW
This ELECTRIC MOTOR WAREHOUSE option provides a 1/30 hp two-speed furnace-style motor with a 5″ diameter and a clocking CCW rotation. The two-speed operation accommodates attic ventilation needs, enabling higher air movement at peak heat and reduced speed for milder days. The motor is a practical choice for fans that require compatibility with standard 115V systems and straightforward installation, especially in retrofits or custom attic fan setups.
Dial 2548 Standard Motor Kit
The Dial 2548 kit features a 1/2 HP, 115V, 2-speed motor with 100% copper windings and a 36″ motor cord. Designed for higher performance attic ventilation, this kit provides robust torque and speed options while maintaining compatibility with common attic fan assemblies. The inclusion of a long motor cord can simplify installation in spaces with longer wiring runs, and the copper windings emphasize efficiency and durability in hot attic environments.
Makevivi Replacement Kit for Lomanco Fans
The Attic Fan Replacement Motor Kit by Makevivi includes a F0510B2944 motor and mounting hardware, designed for Lomanco 2000 series replacements. The kit comes with three mounting wings and nylon lock nuts, along with an instruction manual. The motor itself delivers 1/10 HP at 1100 RPM with clockwise rotation when facing the shaft. It emphasizes ease of DIY installation and compatibility with a broad range of Lomanco configurations, making it a practical upgrade option for older attic fans.
SEAHEE DL1036 Blower Fan Motor
The SEAHEE DL1036 delivers a 1/3 HP, 1075 RPM, 8.0 A motor with a 1/2″ x 4.5″ shaft and reversible rotation. It is compatible with a range of replacement models from A.O. Smith, Fasco, GE, Emerson, Dayton, and others. This versatility makes it a strong candidate for users seeking a high-torque attic fan motor that can replace several legacy models. The gear-ready power and quiet operation through precise coil design are notable features for attic cooling systems requiring dependable performance at varying speeds.
Siasky Universal Bathroom Vent Motor Kit
Siasky’s universal bathroom vent motor kit provides a 120V, 50 CFM, 0.6 A motor with 3000 RPM and 60 Hz. While marketed for bathroom vents, the kit’s 5/8 coil pack and compact dimensions make it adaptable for small attic fan applications with compatible mounting and shaft dimensions. The design emphasizes low noise and compact size, suitable for attic spots where space and quiet operation are priorities. Always verify shaft size and rotation direction before installation in attic fans.
Buying Guide: Key Considerations for 2 Speed Attic Fan Motors
- Speed and torque: Two-speed motors should offer a robust high setting for peak attic heat and a lower setting to manage energy use and reduce noise during milder days. Match horsepower and RPM with your existing fan’s requirements.
- Mounting compatibility: Attic fans use standardized frame sizes (for example, 48Y) or specific mounting brackets. Confirm the frame size, shaft diameter, and mounting hole pattern before purchasing a replacement kit.
- Voltage and phase: Most attic fan motors operate on 115V or 120V, with single or split-phase configurations. Ensure compatibility with your electrical setup and wiring harness.
- Enclosure and bearings: A totally enclosed motor enclosure helps protect the windings in dusty attic environments. Ball bearings typically offer longer life but may require lubrication schedules.
- Installation effort: Some kits come with mounting wings, nylon nuts, and instruction manuals to ease DIY installation. Consider whether you need a universal mounting hardware kit or a direct replacement.
- Compatibility with existing brands: Several replacement options target Lomanco or Lomancool models and other common brands. Verify model compatibility by cross-checking the motor specifications (RPM, shaft length, rotation direction).
- Quiet operation: Sones and bearing quality influence attic comfort. Look for balanced rotors and quality coil windings that minimize vibration and noise at both speeds.
- Cost and availability: Replacement motors range in price and availability. Consider long-term maintenance, spare parts, and ease of obtaining a matching replacement kit if needed.
- Warranty and support: Check manufacturer warranties and customer support resources, especially for DIY installations or retrofits in older attic fans.
When selecting a two-speed attic fan motor, compare the product specifications against your current fan’s requirements. Prioritize frame compatibility, RPM range, and the inclusion of necessary mounting hardware. For installations in Lomanco or Lomancool systems, verify the exact model and shaft dimensions to ensure a seamless fit. This approach helps ensure reliable ventilation performance across varying summer conditions while controlling energy consumption and noise levels.