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The CLEVELAND CONTROLS DFS-221-222 is an airflow proving switch designed for duct heater, oven, and other HVAC or Energy Management applications where an open-mounted, nonadjustable switch is desirable. It can be used to sense positive, negative, or differential air pressure. The plated housing contains a diaphragm and a snap-acting SPDT switch that operates on pressure rise of 0.05"w.c., ± 0.02"w.c.
This switch has 1/4" 90º quick connect spade terminals and two sample line connectors (1/4" OD slip-on fittings) that accept flexible tubing.
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