An air conditioner includes an outdoor heat exchanger that is divided into a plurality of unit paths. The method includes receiving an e-mail, the e-mail including addressing information in an e-mail header and an the e-mail body. The circuit outputs a reference voltage with zero temperature coefficient, which is independent to T and T ln. A baffle plate includes a plurality of apertures positioned such that the exhaust passes through the apertures prior to entering the substrate. A federated database may archive the receive data transfer objects as well as analysis data specific to the business operations client application.