Disinfectant fogging is designed to create an atmosphere so that airborne, surface and small inaccessible spaces are disinfected of germs (pathogens, viruses, bacteria, mold, etc.). To accomplish this successfully in large spaces such as manufacturing facilities that have ceilings in excess of 25 feet, you need to start thinking of cubic feet, not square feet. Handheld fogging equipment cannot create the necessary atmosphere to be truly effective, and therefore these spaces are not are sufficiently treated.