Goodman B1859005S Induced Draft Motor – Genuine OEM 1/48 HP 115V 1.5A Class B

The Goodman B1859005S Induced Draft Motor is the critical "venting brain" for your high-efficiency gas furnace. This genuine OEM component is responsible for creating the negative pressure required to pull combustion air through the heat exchanger and safely exhaust flue gases out of your home. Engineered specifically for Goodman, Amana, and Janitrol furnace series, this 1/48 HP motor acts as a safety gatekeeper; it must reach full speed to close the furnace pressure switch before the ignition sequence can begin. By replacing a failing inducer with this factory-authorized assembly, you ensure your heating system maintains the precise static pressure needed for a clean, safe, and efficient burn. 

Key Features and Function:

• Precision Combustion Airflow: Calibrated to the exact RPM and static pressure requirements of 115V Goodman cabinets to ensure reliable venting and heat transfer.
• Genuine OEM Reliability/Fitment: Designed by Goodman Manufacturing as a direct-fit replacement, ensuring the mounting holes and gasket surfaces align perfectly with the collector box.
• Heavy-Duty Class B Build: Features high-grade Class B insulation and permanently lubricated bearings to withstand the high ambient temperatures of the burner compartment.
• Direct-Fit Design/Plug-and-Play: Includes factory-terminated wiring leads for a seamless connection to the integrated furnace control board, eliminating the need for wire splicing. 

Product Details and Key Specifications:

• Part Number: B1859005S (Replaces B1859005, 7021-9450, 7021-10023)
• Manufacturer: Goodman / Amana (Genuine OEM)
• Part Type: Induced Draft Motor / Combustion Blower
• Voltage: 115V
• Amperage: 1.5 Amps
• HP / RPM: 1/48 HP @ 3000 RPM (Nominal)
• Phase / Hertz: Single-phase (1PH) / 60 Hz (Note: 3-wire lead configuration)
• Insulation: Class B
• Shipping Weight: 3.1 lbs 

🛠️ HVAC Depot Pro Tip: Check for Collector Box Rust 

Before installing your new B1859005S, inspect the plastic collector box where the motor mounts. Rust or debris from the heat exchanger often settles here and can clog the small vacuum port leading to the pressure switch. During your Diagnostic Check, verify that the inducer spins freely by hand before applying power. If the motor hums but doesn't turn, it is likely seized and must be replaced to prevent blowing the 3-amp fuse on your furnace control board. Always replace the mounting gasket to prevent carbon monoxide leaks. 

Cross-Reference & Compatibility:

The B1859005S is a direct OEM replacement for the following part numbers:

• OEM Numbers: B1859005, B18590-05, B1859000S, B1859005S
• Fasco / Aftermarket: 7021-9450, 7021-10023, 7021-10141, 7021-8735
• Jakel / Rotom: J238-150-1533, FB-RFB590 

Extensive Model Compatibility List:

Note: Use 'CTRL+F' to search for your specific model: 

• Goodman GMS8 Series: GMS80403AN, GMS80603AN, GMS80804BN, GMS81005CN
• Goodman GDS8 Series: GDS80403AX, GDS80603AX, GDS80804BX, GDS81005CX
• Amana AMES8 Series: AMES80403AN, AMES80603AN, AMES80804BN
• Janitrol GMP Series: GMP050-3, GMP075-3, GMP100-3, GMP100-4, GMP125-4, GMP150-5
• Janitrol GDT Series: GDT050-3, GDT075-3, GDT100-4, GDT115-5
• GMC Units: Various legacy 80% AFUE furnace configurations.