“Based on the cleanliness of the kitchen exhaust system pre and post-trial, we have determined that the Shepherd Filters have effectively maintained the cleanliness of the downstream internal surfaces of the kitchen exhaust system. If the entirety of the kitchen exhaust system was in a visibly clean condition and the Shepherd Filters installed and maintained as per the manufacturer’s recommendations, it is likely that the cleanliness of the downstream internal surface of the entire system would remain free from excessive oil and grease buildup for several years.”