Description
The Cleveland Controls AFS-405-121 SPDT Air Switch for HVAC airflow proving and control applications. It operates within an adjustable range of 0.05 to 12 inches of water column and uses gold electrical contacts to ensure stable low-current switching and corrosion resistance. mounted in air handling units, furnaces, and ventilation systems, it detects differential, positive, or negative air pressure through connected tubing. Within the system, it operates as a safety and verification part, confirming proper airflow before allowing equipment operation and supporting the prevention of system due to restricted or failed air movement in HVAC systems.
