Interview with Robert Pettyjohn (NORMI Trainer) 2022 by NORMI published on 2023-01-28T14:18:37Z Interview with Robert Pettyjohn about (Many Topics in the IAQ Space) Interviewer Lance Eisen (NORMI) Please visit https://www.normi.org/normi-tv/ for more information about NORMI™ and the NORMI™ TV Channel. Genre Indoor Air Quality