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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
the regulator must be field-adjusted to 2
Is this expansion module compatible with older Ultra Series boilers
Key Benefits Precise Calibration: Factory-set at
Designed for precision fitment in G7S
Durable Construction: High-grade polypropylene housing resists chemical degradation from acidic condensate
Lennox 51M91 Gasket 321042-401 the regulator must be field-adjustedThe Lennox 51M91 Blower Gasket is a critical high temperature seal designed specifically for Lennox furnace blower assemblies and 4 inch inducer motor housings. Engineered to withstand the thermal cycling inherent in high efficiency HVAC systems, this 4 inch blower gasket ensures an airtight seal between the blower housing and the furnace cabinet, preventing bypass air and maintaining static pressure integrity. This OEM replacement component is vital