Lennox 59W40 Proving Switch 321702-401 Heavy-Duty Construction: Manufactured with high-quality

Heavy-Duty Construction: Manufactured with high-quality metals to resist corrosion and handle the thermal stresses of continuous cycling

The sensing element utilizes a high-durability pressure-actuated bellows to manage a broad operating pressure range of 50 to 500 psi

the Bard 9043-411 is designed for continuous duty cycles in demanding commercial environments

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helping contractors distinguish between mechanical failure and electrical coil issues

Lennox 59W40 Proving Switch 321702-401 Heavy-Duty Construction: Manufactured with high-qualityThe Lennox 59W40 Blower Proving Switch is a critical safety component designed for specific Lennox furnace models and air handling units. This negative pressure switch is calibrated to a precise . 15" WC setpoint, ensuring the inducer motor or blower assembly is generating sufficient draft before allowing the ignition sequence to proceed. As a genuine Lennox replacement part, the 59W40 ensures seamless integration with the existing control board