Its classic mechanical room thermostat interface is preferred by contractors who prioritize durability and ease of use in environments where digital complexity is unnecessary

maintaining structural integrity across an expansive operating temperature range of -50°F to 220°F (-46°C to 104°C)

For technicians servicing Heil

This precise-fit component supports system longevity by protecting internal electronics from moisture and heat exposure

allowing for precise tracking on hard or soft copper

Cleveland Controls DFS-221-112 Switch Its classic mechanical room thermostatThe Cleveland Controls DFS 221 112 Switch is a fixed setpoint air pressure sensing switch designed for critical airflow proving in duct heaters, ovens, and energy management systems. This SPDT airflow switch is factory calibrated to actuate on a pressure rise at 0. 05" WC ( 0. 02" WC), making it an ideal solution for applications requiring a non adjustable, tamper proof safety interlock. Built with a durable silicone diaphragm and a zinc plated steel