| 摘要 |
A humidifier unit for a warm air-heating system including a solenoid valve controlled water spray nozzle to be located in a portion of the air passage system through which warm air leaves a furnace to discharge a fine mist spray into the leaving air, a manually variable temperature-sensitive switch for sensing the air temperature in the passage, a sail switch activated by airflow through the air passage system, and an electrical circuit interconnecting the solenoid valve with the switches to operate the valve.
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