Both vapor and fogging distribute a hydrogen peroxide solution into the air, with the goal of killing microorganisms on exposed surfaces. But fogging is a distinctly different technology from vapor. Fogging systems produce aerosol droplets that typically range from 8-12 microns in diameter.
In contrast, vaporized hydrogen peroxide is a vapor, unaffected by gravity unlike aerosolized liquid droplets. This affects how evenly the solution is distributed, both in the air and on surfaces.