Modine 5H0730570003 Block Vent Switch while the base number is

while the base number is the factory-spec identifier

ensuring accurate motor circuit engagement and disengagement

As a critical OEM replacement part

Whether you are performing a boiler replacement or a routine water heater repair

Is the 90-291Q suitable for 240V coil applications

Modine 5H0730570003 Block Vent Switch while the base number isThe 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),