It is specifically built for 1/4" O

allowing the control board to safely isolate low-voltage signals from high-voltage blower loads

and materials are identical for both part numbers

maintaining long-term system calibration

Direct fit replacement for White Rodgers / Copeland Comfort Control systems

Cleveland Controls DFS-221-228 Pressure Switch It is specifically built forThe Cleveland Controls DFS 221 228 is a high reliability, non adjustable airflow proving switch designed for critical monitoring in duct heaters, ovens, and sophisticated energy management systems. Engineered for technicians who require a "set and forget" solution, this SPDT air pressure switch is factory fixed to operate on a pressure rise of 0. 05 0. 02" w. c., ensuring precise safety interlocks. Its compact, open mounted design is specifically