Study of bathroom ventilation fan performance trends for years 2005 to 2013-Data analysis of loudness and efficacy

In order to investigate year-to-year changes, this paper first evaluates changes in loudness ratings for the test period 2005-2013, and its relevance to applicable standards, including ASHRAE 62.2. Then, noticeable transitions in loudness and efficacy in specific time frames are investigated. The test results of DC-motor high-efficiency bathroom fans are also compared to AC-motor fans. Relationships between performance variables and loudness are investigated, and formulated by developing regression models.