We have 7 HEPA filters throughout the office. ONE is supposed to purify a 2,500 sq foot area every 25 min. This is in an effort to keep the air as free of any particulate matter as possible.
We run a UV light in the treatment rooms between every patient and at the end of each day in an effort to kill/denature anything airborne. We actually did this before this year because we believe in great hygiene in your mouth and out of your mouth.
AC building fan runs all day to keep the air turnover at a maximum in each room.