I think you probably right. It can be considered as a powerful vent fan. Our house is over 2800 sq ft and the unit is able to keep the humidity down for the whole house. It turns itself off when the humidity is at the set level, and when on, the noise is lower than my Euroreef CS8-2 pump.
A little more info on this site
http://www.humidexatlantic.com/humidex_home