Lennox 27M18 Orifice 321702-401 If your draft inducer blower

If your draft inducer blower is seized or failing to reach 3000 RPM

High Flow Rate: The 10-row configuration maximizes surface area for filtration while maintaining low static pressure

the HH18HA120 offers a compact form factor for swift installation in tight furnace or air handler cabinets

Built for the veteran technician

Lennox 27M18 Orifice 321702-401 If your draft inducer blowerThe Lennox 27M18 Orifice is a precision engineered 052 sized flow control component essential for maintaining the manifold pressure and combustion efficiency of Lennox commercial and residential heating systems. Designed as a direct OEM replacement part, this orifice (MPN: 27M18, replaces LB 99225) ensures accurate gas metering for Lennox T Class rooftop units and gas furnaces, specifically compatible with models including KGA036S4, KGA092, and LGH180