Circuit board manufactured for Trane and American Standard equipment. Parts listed here are genuine factory parts . They are labeled as Service First which is the Trane and American Standard brand for their parts line. American Standard equipment is a division of Trane Corp. If you are not sure which circuit board is correct for your application please contact us with your equipment model number and we will be happy to identify the correct part for you. We always recommend using the correct circuit board for your equipment instead of an after market board as there are factory specific algorithms designed into most circuit boards that will increase the efficiency and life of your equipment. The UL rating will also be maintained when you use the factory approved part.