Whether you are troubleshooting a Trane heater fusible link failure or performing preventative maintenance on a furnace

and 3007 dielectric unions

this 4-3/4 inch centrifugal blower wheel features a 1/4 inch bore and CCW (counter-clockwise) rotation

Durable Construction: Built for board-mounted high-heat environments with a 3" probe for accurate internal plenum temperature sensing

Heavy-Duty Construction: Built to withstand the operational stresses of smoke and combination fire/smoke dampers

Lennox 20J91 Flame Sensor Whether you are troubleshooting aReplace your worn or fouled Lennox 20J91 with this authentic Lennox Flame Sensor to ensure reliable flame rectification and consistent ignition cycles. As a veteran grade OEM furnace replacement part, this sensor is engineered to provide precise microamp signal feedback to the furnace control board, preventing safety lockouts and intermittent heating failures. The 20J91 is functionally identical to the 20J9101 and serves as a direct fit component for