When replacing an older furnace blower motor

this limit switch should show continuity (0 ohms)

Enhanced Arc Protection: Built-in arc barriers significantly reduce the risk of short-circuits during high-current switching cycles

By installing this genuine HVAC integrated control board

McCally Tools JC-5216 Squeeze Bulb 30067439-890 When replacing an older furnaceThe McCally Tools JC 5216 Squeeze Bulb is a professional grade HVAC squeeze bulb engineered for high precision pressure testing and pneumatic calibration. For veteran technicians managing furnace boiler ventilation testing, this hand operated air pump provides the tactile feedback necessary for fine tuning draft gauges and manometers. Unlike automated pumps, the manual operation of the McCally Tools JC 5216 enables a steady, controlled delivery of air