There are many Agencies that offer Compliance Marks for products that were tested to domestic and international Standards. Domestically (North American Market) our ovens comply with UL 923 (Safety Standard – Microwave Cooking Appliances), CSA C22.2 No. 150 (Safety Standard – Microwave Ovens), and NSF 4 Standard (Sanitation Standard – Commercial Cooking, Rethermalization, and Powered Hot Food Holding and Transport Equipment). All ACP, Inc. ovens comply with these standards. We use the ETL marks to indicate compliance.