Lennox 36N77 Hot Surface Ignitor Vent Limiting Technology: The factory-installed

Vent Limiting Technology: The factory-installed integral vent limiter ensures safe operation by restricting gas escapement in the event of diaphragm rupture

This genuine OEM replacement part is specifically designed for Modine PD400 and BD400 unit heaters

Robust Construction: Engineered to perform reliably in high-cycle industrial and commercial settings

While specifically designed for the Q624 and Q652 series

Applying 46226200 motor oil during annual power venter maintenance ensures the mechanical assembly handles the thermal stress of continuous operation without seizing

Lennox 36N77 Hot Surface Ignitor Vent Limiting Technology: The factory-installedThe Lennox 36N77 Hot Surface Ignitor is a critical OEM replacement part designed for high performance gas fired combustion systems. Also identified by the identical part number 36N7701, this nitride ignitor is engineered to withstand extreme thermal cycling within residential furnaces and boilers. As a direct fit HSI, it ensures precise gas ignition by delivering a robust heat source that interfaces seamlessly with the furnace's integrated control