The HEPA 500 is one of our favorite pieces of equipment and is used on a number of categories of losses, including mold, fire and sewage jobs. This example is a category-3 sewage back up. It uses negative air and HEPA filter media to scrub the air with an efficiency rating of 99.7% to quickly and effectively maintain a clean and odor free air environment. On fire jobs, it helps to remove the smoke odor from the contents and structure with an addition of a tertiary carbon filter. On mold jobs it scrubs any airborne mold particulates. Let SERVPRO of Palo Alto remove your problem odor, call us if you need us: 650-800-3448.