Honeywell 4074ERU Weatherproofing Kit The Cleveland Controls DFS 221 112 Switch The Cleveland Controls DFS 221 112 Switch is a fixed setpoint air pressure sensing switch designed for critical airflow proving in duct heaters System Longevity: Prevents excessive thermal stress on the heat exchanger and surrounding components product data and specifications are subject to change shaft seals
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Honeywell 4074ERU Weatherproofing Kit The Cleveland Controls DFS-221-112 Switch