Most failures result from a loss of the thermostatic charge due to capillary tube vibration rub-through or diaphragm fatigue

This switch typically opens due to a blocked chimney

and ductwork for airflow obstructions

Wide Duct Reach: Optimized for 8-foot to 12-foot duct widths to ensure comprehensive smoke sampling

For contractors

Antunes Controls 8023202113 Air Switch Els PW 17895 Most failures result from aAs a technician, you know that keeping a system operating at peak efficiency requires reliable components like the Antunes Controls 8023202113 Air Switch. This SMD series air pressure switch is a specialized differential pressure sensor calibrated to a fixed set point of 0. 30" W. C., making it essential for proving airflow in commercial HVAC and food service equipment. This kit includes a 90 foot tube, providing substantial reach for remote mounting