the device must be installed with the diaphragm in a vertical plane

it effectively dampens operational vibration and compensates for parallel

Specifically engineered for the Honeywell HE360 and HE365 series

making it a standard in every veteran technician’s van

Cleveland Controls DFS-221-153 Switch the device must be installedThe Cleveland Controls DFS 221 153 is a precision engineered airflow proving switch designed for critical monitoring in duct heaters, commercial ovens, and high demand HVAC systems. This differential air pressure sensing switch features a factory fixed setpoint of 0. 05" W. C., making it an ideal choice for applications requiring a non adjustable, tamper proof safety control. Built with a robust zinc plated housing and a high performance silicone