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The standard M2-875 does not include a boot
The moisture-resistant construction of the AMC model prevents shorting in high-humidity applications
The 3-blade configuration balances motor load with airflow efficiency
Durable Construction: Features a rugged
square-shaped plastic cover is engineered as a direct replacement for the Barber Colman 21-928 series and multiple legacy part numbers
Reznor 177633 Pressure Switch 30067439-890 The standard M2-875 does notThe Reznor 177633 Pressure Switch is a critical OEM replacement part designed for precision monitoring within commercial gas heating systems. Engineered for unit heaters and duct furnaces, this combustion air pressure switch kit is factory calibrated to a 0. 50" W. C. setpoint (water column). The Reznor 177633 ensures safe ignition sequences and reliable venting verification by detecting proper differential pressure before allowing the gas valve to