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On Demand In late 2019 (before the onset of the COVID-19 pandemic), while allergies, asthma and other respiratory illnesses continued to rise, The Field Controls product development team was chartered with a singular mission: “Develop the best whole house, electronic air purification system available.” To do this, the team set out to improve on our TRIO™ of Filtration, UV-C and PRO-Cell technologies to deliver a best-in-class air purification system.