Lennox 21W66 Gasket 321894-709 determined by looking at the

determined by looking at the discharge side of the air

Precision Balancing: Factory-balanced to reduce harmonic noise and prevent premature bearing failure in the furnace blower motor

utilizing an 06 orifice size for consistent flow regulation

The S40 supports Lennox Smart Room Sensors and Smart Air Quality Monitors

replacing damaged or aged covers without modification

Lennox 21W66 Gasket 321894-709 determined by looking at theThe Lennox 21W66 Gasket is a critical OEM replacement component engineered specifically for induced draft assembly sealing in high efficiency residential and commercial heating units. As a veteran tech knows, a compromised seal at the inducer motor lead to pressure switch trips and flue gas leakage. This draft inducer blower gasket (cross referenced as LB 106197) is designed to withstand high temperature combustion environments while maintaining a