Q: Is the liquid disinfectant safe for other room furnishings and appliances? A: Yes; far less corrosive than the standard products for hospital cleaning today (bleach, hydrogen peroxide). The spray is formulated to reach complete disinfection at the lowest possible concentration. Q: What are the safety precautions? A: The EPA regulations require that all fogged disinfectants are fully in the room. The system is controlled from outside the room, via remote control. Q: What size of room is the air disinfectant treating machine? A: In about 10 to 12 minutes, you can cover a normal 240 cubic meter classroom or, if you disinfect a car, turn the air conditioner to recycle and use it for 30 seconds at a time. Q: How long should you be leaving the fog to settle after the treatment? A: It is important to allow the fog to rest, so that the fog has sufficient time to cover the surface of objects and form a protective shield. Fog is very light so drifting in the air will take some time before falling on the objects. The recommended minimum time is 10 minutes; however better coverage will be seen over a longer period.