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Common Questions Is a keyway required for this specific 3/8" bore size
Key Benefits: Precise Thermal Calibration: Opens at 160°F (+/- tolerance) and automatically resets at 130°F to prevent heat exchanger fatigue
it indicates an underlying airflow issue or combustion problem that must be diagnosed by a technician
maintaining consistent motor control under heavy electrical loads
In most field scenarios
Modine 5H0730570003 Block Vent Switch Common Questions Is a keywayThe Modine 5H0730570003 Blocked Vent Switch is a critical safety component engineered to monitor flue gas temperatures and prevent hazardous operating conditions. This genuine OEM replacement part is specifically designed for Modine PD400 and BD400 unit heaters, serving as the direct functional successor to the legacy 5H73057 3 model. Operating as a manual reset safety switch, it is calibrated to trip when vent temperatures reach 200F (93C),