the clinic i do financials for looked into these and the ones they were looking to buy took 15 minutes to sweep a regular sized patient room. which was prohibitive for them. but it looks like this one might only take 7 minutes.
This is not a great solution for surfaces that are not being exposed to the UV Light. There are better liquid solutions on the market that allow you to fog an entire room, then in 10 minutes it can be occupied. Also, electrostatic sprayer would work better if the chemical is correct since it will cover the entire surface. Unfortunately, most of the common old chemistry requires everything to be wiped/rinsed back off and most do not do it.
Lots of fraud and snake oil going on in the Covid-19 fight from UV lights to old chemistry like Quaternary Ammonium (Quats) and/or hydrogen peroxide creating very toxic mixes and build up. Example, if your cleaning company or you are using a concentrated Quats mix that you mix with water, nearly all if not all are caustic, deteriorate hard surfaces and required to made daily per most labels, which isn’t in a lot of cases. Ever sat in a restaurant and the chairs or table was sticky? That's not pop residue, that’s Quats deteriorating the surface and your skin is also absorbing it. Also, most people that apply it, don’t realize that you have to leave it on the surface per the label (likely 3-10 minutes depending on the recipe/various chemicals), then go back and completely rinse it all back off.
Your client would be better served using more cutting-edge chemistry solutions in the market place. In this case, the best ones have no chemical cloth binding, require no rinsing, can fog are room, and the efficacy is not changed by even electrostatic sprayers. Also, they don't degrade hard surfaces and don't dry as a toxin. Similar solutions are available for treating air duct systems.
Right now, all these cheap old commodity chemistries are building up, deteriorating surfaces and are not good for humans and in many cases not effective. If you see a surfaces deteriorating like a door handle, light switch, paint being removed from disinfecting, stainless steel rusting, plastic.....the staff is probably using Quats. Pine-Sol and Lysol are two consumer brands that are Quats, BTW. Some of the products say they kill covid-19 on a surface for up to 90 days…which is also false.