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The ES2000 Series air-pressure switch is designed to detect blockage in gas combustion system appliances, such as furnaces, boilers, gas fireplaces, and water heaters. According to the company, other typical functions include performing draft inducer verification, detecting condensate drain blockage, proving fan operation, and proving a blocked filter with change in differential pressure. It has integrated sample line connectors, a -40 degrees to 190 degrees F (-40 degrees to 88 degrees C) operating temperature range, and an overpressure rating of 3 psi. Setpoints are available from 0.10 to 5.0 inches water column with narrow switch differentials.