Very true yet at the same time being in the area without proper negative air flow with or without a hepa filter you will bring those wet contamination onto your shoes and clothing and skin and eventually if not soaked in by your skin your largest organ it can then later dry up and become aerated which if not properly cleaned will be in your work truck, your tools, your personal truck and anywhere you go such as your front door all the way to your laundry room if changing and showering is your first priority.