the system only introduces outdoor air when needed

OEM Precision: Direct fit replacement for part number 025-18452-000

maintaining system stability and operational integrity

though it can be mounted horizontally

Standard Compatibility: The 9-13 PSI spring range integrates seamlessly with standard pneumatic controllers and building automation systems

Lochinvar & A.O. Smith 100108882 Pressure Switch 318172-701 the system only introduces outdoorThe Lochinvar 100108882 (also indexed under A. O. Smith 100108882) is a critical safety differential air pressure switch designed for commercial boilers and water heaters. Calibrated for a fixed setpoint of 1. 10" W. C., this SPNO (Single Pole Normally Open) switch ensures the combustion blower is generating sufficient airflow before allowing the ignition sequence to proceed. As an OEM replacement part, it is engineered to maintain high limit accuracy