74188389
Jul 25, 1991
indoor air cleaning devices, including all types of air filters for removing airborne contaminants, air to air exchange and energy recovery systems, indoor air sampling and testing systems, indoor air quality diagnostic and monitoring systems, indoor air quality mitigation systems, ventilation systems, indoor particulate diagnostic and removal systems, volatile organic compound diagnostic and removal systems, equipment for improving air qualtiy, flow or transfer, and any and all source removal products or systems associated with improving indoor air quality
Environmental Control Apparatus