We redesigned the Cool Mist Humidifier (CMH) to be more robust (insensitive to variations), easier to assemble, and less expensive to manufacture.  Our primary goal for satisfying the customers was to create a product with a quieter operation at a lower cost.  We were able to reduce the noise of the humidifier by increasing the fan size and reducing the speed at which the fan runs, creating a quieter tone.  Another factor that contributed to the noise level was the path of the air flow through the humidifier.  We redesigned the base tray and the main frame to create a “straight-shot” airflow thereby minimizing the noise.  We also eased maintenance for the user by lengthening the handle of the tray for easy removal. Reducing the cost of the Cool-Mist Humidifier for the customer begins with reducing the manufacturing costs, which was achieved by reducing part count and assembly time.  Snap-fits replace multiple screws which has a considerable cost effect by both removing fasteners and easing the assembly process.  This redesign was developed by James Guo and Steve Meinschein in Winter 2004, instructors: Prof. Sridhar Kota, and Mentor Dr. Donald Malen.

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