Kitchen Exhaust Hood Cleaning is a recession proof business because all restaurants across the country MUST clean their exhaust hood system periodically, 1-12 times a year or the grease from the cooking builds up so much that it becomes a fire hazard to the restaurant. Thus, fire inspectors throughout the USA and Canada will inspect all commercial kitchen exhaust hood systems to make sure that they are NFPA Compliant and cleaned prior to the grease build up. As long as, restaurants cook food, this industry will always exist whether the economy is slow or thriving.