Lennox 71W28 Gasket 321702-401 using the 903075 blower motor

using the 903075 blower motor ensures the correct shaft length

While it can monitor loads controlled by a VFD

or sense a vacuum by connecting only the low-pressure port and leaving the other open to ambient pressure

Optimized Performance: Efficiently handles air venting and non-condensable gas removal to improve heat transfer across the system

It utilizes a standard 10k Type II or Type III thermistor curve consistent with McQuay replacement parts specifications to ensure accurate resistance-to-temperature conversion by the controller

Lennox 71W28 Gasket 321702-401 using the 903075 blower motorAs a seasoned technician, you know that a compromised seal on a 70 90 furnace can lead to pressure switch trips and combustion inefficiency. The Lennox 71W28 Gasket is the specific OEM collector box gasket designed to restore the airtight integrity of the flue system. Specifically engineered for Lennox furnace repair, this component (also identified as part number 102515 01) ensures that exhaust gases are properly contained within the collector box