I have bad allergies, and my air purification device at my house is always on to keep the air free from airborne pollutants.
When I got to the home service offices, my boss handed me the different jobs to attend to for that morning, I gathered up the rest of the HVAC professionals, and as a team, we started our rounds.
The first customer we visited that day was the local government hospital. They had contacted us the previous day to inquire about air purification help. The hospital had a whole-home air purification system, but it seemed to need to work more efficiently. A couple of patients had allergy flare-ups after entering the hospital. I was impressed by their smart HVAC system, but it needed to be in better condition. We started by running a comprehensive tune-up on the HVAC equipment and changed a few worn-out components. We then proceeded to check on the air purification system. The air filters were so dirty they had turned black, so we switched them to new, clean ones. We also noticed a lot of dust and dirt in the vents, and I delegated duct cleaning duty to two of my HVAC technicians. As we tested the airflow, I saw a familiar person standing in the corridor. The man looked my way, continued walking, and then quickly looked back and called out my name. It was my highschool best friend. He was now a doctor! After briefly talking, I explained that we would soon improve the indoor air quality in the hospital. He ran up to us as we were loading our working gear and parts of the HVAC unit that were worn out and happily confirmed everyone had noticed the increased air quality.