The method used in conducting this test was based on the ANSI/AHRI Standard 260 2012 Standard for Sound Rating of Ducted Air Moving and Air Conditioning Equipment.At the request of Natural Resources Canada (NRCan), Exova Canada Inc. (Exova) was contracted to conduct performance testing of a combined space and water heating system (combo) in accordance with applicable Sections of CSA Standard P.9-11 'Test method for determining the performance of combined space and water heating systems (combos)'. more... See more text