Businesses shudder at the cost and trouble of running wires through ducts and ceilings to set up wireless antennas.

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Current HVAC systems get rid of stale, germ-ridden indoor air by cooling or heating fresh outdoor air and blowing it through ventilation ducts, a process that gobbles electricity.

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The lymph nodes normally filter the cellular waste products and debris from infections that travel through the lymph ducts.

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