Lennox 46K90 Inducer Gasket

The Lennox 46K90 Inducer Gasket (also identified by part number 46K9001) is an essential OEM component designed for high-temperature sealing between the draft inducer blower and the furnace collector box. Engineered from a robust fiberglass material, this replacement furnace gasket is built to withstand the rigorous thermal cycling of high-efficiency gas furnaces without degrading. Its precise dimensions—a 7-3/4 inch length and 6-5/8 inch width with a 5-1/8 inch inner diameter—ensure a critical airtight seal that prevents the leakage of combustion byproducts into the mechanical room or living spaces. For technicians servicing Allied, Armstrong, Ducane, or Lennox HVAC equipment, this part is a direct replacement for legacy numbers such as R41667-001 and 20313401. Installing this OEM inducer gasket is standard practice during blower assemblies to maintain proper static pressure and ensure the draft inducer motor operates within factory specifications. Using a genuine Lennox 46K90 ensures compatibility with PGE series and GCS series residential units.

Key Benefits

• High-Temperature Resistance: Constructed from thermal-grade fiberglass to maintain integrity in peak combustion environments.
• Universal Compatibility: Direct fit for multiple brands including Lennox, Armstrong, and Ducane, simplifying truck stock.
• Precision Dimensions: 5-1/8" ID facilitates a snug fit around the blower outlet, preventing bypass and pressure drops.
• System Safety: Prevents the escape of carbon monoxide and other flue gases by ensuring a total seal at the inducer interface.

Common Questions

Why is my inducer motor leaking water or air?
If you notice moisture around the blower or hear air whistling, the Lennox 46K90 Inducer Gasket may have compressed or deteriorated. Replacing it is necessary whenever the motor is pulled for service.

Is the 46K90 compatible with non-Lennox furnaces?
Yes, as a standard part for Allied Air and Armstrong units, it is widely used across several brands under the Lennox International umbrella.

Can I use RTV silicone instead of this gasket?
High-temp RTV is often used as a supplement, but the fiberglass 46K9001 gasket provides the specific thickness and vibration dampening required for a long-term mechanical seal.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.