HALO LED whole home in-duct air purifier uses our revolutionary REME-LED technology to improve air quality throughout your air-conditioned spaces. Easily installed in new or existing air conditioning system ductwork, HALO LED actively reduces airborne bacteria, viruses, odors, mold and allergens ensuring excellent indoor air quality throughout your home. The HALO LED, with new integrated airflow switch, is zero ozone certified and provides a longer product life with improved energy efficiency. A convenient Countdown Day Timer now offers visual indication for when it’s time to replace your REME-LED cell.